diff --git a/api-specs/api/examples/Customer/CustomerAddCustomerGroupAssignmentAction.json b/api-specs/api/examples/Customer/CustomerAddCustomerGroupAssignmentAction.json
new file mode 100644
index 000000000..759435959
--- /dev/null
+++ b/api-specs/api/examples/Customer/CustomerAddCustomerGroupAssignmentAction.json
@@ -0,0 +1,9 @@
+{
+  "action": "addCustomerGroupAssignment",
+  "customerGroupAssignment": {
+    "customerGroup": {
+      "id": "{{customer-group-id}}",
+      "typeId": "customer-group"
+    }
+  }
+}
\ No newline at end of file
diff --git a/api-specs/api/examples/Customer/CustomerGroupAssignment.json b/api-specs/api/examples/Customer/CustomerGroupAssignment.json
new file mode 100644
index 000000000..8b4f2ce1b
--- /dev/null
+++ b/api-specs/api/examples/Customer/CustomerGroupAssignment.json
@@ -0,0 +1,6 @@
+{
+  "customerGroup": {
+    "typeId": "customer-group",
+    "id": "customer-group-1"
+  }
+}
diff --git a/api-specs/api/examples/Customer/CustomerRemoveCustomerGroupAssignmentAction.json b/api-specs/api/examples/Customer/CustomerRemoveCustomerGroupAssignmentAction.json
new file mode 100644
index 000000000..63c520370
--- /dev/null
+++ b/api-specs/api/examples/Customer/CustomerRemoveCustomerGroupAssignmentAction.json
@@ -0,0 +1,7 @@
+{
+  "action": "removeCustomerGroupAssignment",
+  "customerGroup": {
+    "id": "{{customer-group-id}}",
+    "typeId": "customer-group"
+  }
+}
diff --git a/api-specs/api/examples/Customer/CustomerSetCustomerGroupAssignmentsAction.json b/api-specs/api/examples/Customer/CustomerSetCustomerGroupAssignmentsAction.json
new file mode 100644
index 000000000..32a20eff4
--- /dev/null
+++ b/api-specs/api/examples/Customer/CustomerSetCustomerGroupAssignmentsAction.json
@@ -0,0 +1,17 @@
+{
+  "action": "setCustomerGroupAssignments",
+  "customerGroupAssignments": [
+    {
+      "customerGroup": {
+        "id": "{{customer-group-id-1}}",
+        "typeId": "customer-group"
+      }
+    },
+    {
+      "customerGroup": {
+        "id": "{{customer-group-id-2}}",
+        "typeId": "customer-group"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/api-specs/api/types/customer/Customer.raml b/api-specs/api/types/customer/Customer.raml
index 5d58a511a..9e8e1d6d6 100644
--- a/api-specs/api/types/customer/Customer.raml
+++ b/api-specs/api/types/customer/Customer.raml
@@ -140,3 +140,8 @@ properties:
     description: |
       Indicates whether the `password` is required for the Customer.
     default: Password
+  customerGroupAssignments?:
+    type: CustomerGroupAssignment[]
+    (beta): true
+    description: |
+      Customer Groups of the Customer.
diff --git a/api-specs/api/types/customer/CustomerDraft.raml b/api-specs/api/types/customer/CustomerDraft.raml
index 66c71e0c7..3c4c1e34f 100644
--- a/api-specs/api/types/customer/CustomerDraft.raml
+++ b/api-specs/api/types/customer/CustomerDraft.raml
@@ -135,3 +135,8 @@ properties:
       - Set to `Password` to make the `password` field required for the Customer.
       - Set to `ExternalAuth` when the password is not required for the Customer.
     default: Password
+  customerGroupAssignments?:
+    type: CustomerGroupAssignmentDraft[]
+    (beta): true
+    description: |
+      Customer Groups to assign to the Customer.
diff --git a/api-specs/api/types/customer/CustomerGroupAssignment.raml b/api-specs/api/types/customer/CustomerGroupAssignment.raml
new file mode 100644
index 000000000..1adb6ec72
--- /dev/null
+++ b/api-specs/api/types/customer/CustomerGroupAssignment.raml
@@ -0,0 +1,13 @@
+#%RAML 1.0 DataType
+(package): Customer
+type: object
+(beta): true
+displayName: CustomerGroupAssignment
+example: !include ../../examples/Customer/CustomerGroupAssignment.json
+description: |
+  Represents an individual Customer Group assignment as a [Reference](ctp:api:type:Reference) to a [CustomerGroup](ctp:api:type:CustomerGroup).
+properties:
+  customerGroup:
+    type: CustomerGroupReference
+    description: |
+      Reference to a Customer Group.
diff --git a/api-specs/api/types/customer/CustomerGroupAssignmentDraft.raml b/api-specs/api/types/customer/CustomerGroupAssignmentDraft.raml
new file mode 100644
index 000000000..0c22f7a6a
--- /dev/null
+++ b/api-specs/api/types/customer/CustomerGroupAssignmentDraft.raml
@@ -0,0 +1,10 @@
+#%RAML 1.0 DataType
+(package): Customer
+displayName: CustomerGroupAssignmentDraft
+type: object
+(beta): true
+properties:
+  customerGroup:
+    type: CustomerGroupResourceIdentifier
+    description: |
+      ResourceIdentifier of a Customer Group.
diff --git a/api-specs/api/types/customer/updates/CustomerAddCustomerGroupAssignmentAction.raml b/api-specs/api/types/customer/updates/CustomerAddCustomerGroupAssignmentAction.raml
new file mode 100644
index 000000000..97332b787
--- /dev/null
+++ b/api-specs/api/types/customer/updates/CustomerAddCustomerGroupAssignmentAction.raml
@@ -0,0 +1,14 @@
+#%RAML 1.0 DataType
+(package): Customer
+type: CustomerUpdateAction
+(beta): true
+displayName: CustomerAddCustomerGroupAssignmentAction
+discriminatorValue: addCustomerGroupAssignment
+example: !include ../../../examples/Customer/CustomerAddCustomerGroupAssignmentAction.json
+description: |
+  Adds a single Customer Group to the Customer's list of `customerGroupAssignments`. Adding a Customer Group generates the [CustomerGroupAssignmentAdded](ctp:api:type:CustomerGroupAssignmentAddedMessage) Message.
+properties:
+  customerGroupAssignment:
+    type: CustomerGroupAssignmentDraft
+    description: |
+      Customer Group to assign to the Customer.
diff --git a/api-specs/api/types/customer/updates/CustomerRemoveCustomerGroupAssignmentAction.raml b/api-specs/api/types/customer/updates/CustomerRemoveCustomerGroupAssignmentAction.raml
new file mode 100644
index 000000000..a9d1ece10
--- /dev/null
+++ b/api-specs/api/types/customer/updates/CustomerRemoveCustomerGroupAssignmentAction.raml
@@ -0,0 +1,14 @@
+#%RAML 1.0 DataType
+(package): Customer
+type: CustomerUpdateAction
+(beta): true
+displayName: CustomerRemoveCustomerGroupAssignmentAction
+discriminatorValue: removeCustomerGroupAssignment
+example: !include ../../../examples/Customer/CustomerRemoveCustomerGroupAssignmentAction.json
+description: |
+  Unassigns a Customer Group from a Customer. Unassigning a Customer Group generates the [CustomerGroupAssignmentRemoved](ctp:api:type:CustomerGroupAssignmentRemovedMessage) Message.
+properties:
+  customerGroup:
+    type: CustomerGroupResourceIdentifier
+    description: |
+      Customer Group to unassign from the Customer.
diff --git a/api-specs/api/types/customer/updates/CustomerSetCustomerGroupAssignmentsAction.raml b/api-specs/api/types/customer/updates/CustomerSetCustomerGroupAssignmentsAction.raml
new file mode 100644
index 000000000..d24fcb502
--- /dev/null
+++ b/api-specs/api/types/customer/updates/CustomerSetCustomerGroupAssignmentsAction.raml
@@ -0,0 +1,14 @@
+#%RAML 1.0 DataType
+(package): Customer
+type: CustomerUpdateAction
+(beta): true
+displayName: CustomerSetCustomerGroupAssignmentsAction
+discriminatorValue: setCustomerGroupAssignments
+example: !include ../../../examples/Customer/CustomerSetCustomerGroupAssignmentsAction.json
+description: |
+  Assigns multiple Customer Groups to a Customer. Assigning Customer Groups generates the [CustomerGroupAssignmentsSetMessage](ctp:api:type:CustomerGroupAssignmentsSetMessage) Message.
+properties:
+  customerGroupAssignments:
+    type: CustomerGroupAssignmentDraft[]
+    description: |
+      Customer Groups to assign to the Customer.
diff --git a/api-specs/api/types/message/CustomerGroupAssignmentAddedMessage.raml b/api-specs/api/types/message/CustomerGroupAssignmentAddedMessage.raml
new file mode 100644
index 000000000..e6735002a
--- /dev/null
+++ b/api-specs/api/types/message/CustomerGroupAssignmentAddedMessage.raml
@@ -0,0 +1,13 @@
+#%RAML 1.0 DataType
+(package): Message
+type: Message
+(beta): true
+displayName: CustomerGroupAssignmentAddedMessage
+discriminatorValue: CustomerGroupAssignmentAdded
+description: |
+  Generated after a successful [Add CustomerGroupAssignment](ctp:api:type:CustomerAddCustomerGroupAssignmentAction) update action.
+properties:
+  customerGroupAssignment:
+    type: CustomerGroupAssignment
+    description: |
+      [CustomerGroupAssignment](ctp:api:type:CustomerGroupAssignment) that was added during the [Add CustomerGroupAssignment](ctp:api:type:CustomerAddCustomerGroupAssignmentAction) update action.
diff --git a/api-specs/api/types/message/CustomerGroupAssignmentRemovedMessage.raml b/api-specs/api/types/message/CustomerGroupAssignmentRemovedMessage.raml
new file mode 100644
index 000000000..054a28446
--- /dev/null
+++ b/api-specs/api/types/message/CustomerGroupAssignmentRemovedMessage.raml
@@ -0,0 +1,13 @@
+#%RAML 1.0 DataType
+(package): Message
+type: Message
+(beta): true
+displayName: CustomerGroupAssignmentRemovedMessage
+discriminatorValue: CustomerGroupAssignmentRemoved
+description: |
+  Generated after a successful [Remove CustomerGroupAssignment](ctp:api:type:CustomerRemoveCustomerGroupAssignmentAction) update action.
+properties:
+  customerGroupAssignment:
+    type: CustomerGroupReference
+    description: |
+      [CustomerGroupAssignment](ctp:api:type:CustomerGroupAssignment) that was removed during the [Remove CustomerGroupAssignment](ctp:api:type:CustomerRemoveCustomerGroupAssignmentAction) update action.
diff --git a/api-specs/api/types/message/CustomerGroupAssignmentsSetMessage.raml b/api-specs/api/types/message/CustomerGroupAssignmentsSetMessage.raml
new file mode 100644
index 000000000..f60383ed3
--- /dev/null
+++ b/api-specs/api/types/message/CustomerGroupAssignmentsSetMessage.raml
@@ -0,0 +1,13 @@
+#%RAML 1.0 DataType
+(package): Message
+type: Message
+(beta): true
+displayName: CustomerGroupAssignmentsSetMessage
+discriminatorValue: CustomerGroupAssignmentsSet
+description: |
+  Generated after a successful [Set CustomerGroupAssignments](ctp:api:type:CustomerSetCustomerGroupAssignmentsAction) update action.
+properties:
+  customerGroupAssignments?:
+    type: CustomerGroupAssignment[]
+    description: |
+      List of [CustomerGroupAssignments](ctp:api:type:CustomerGroupAssignment) that were set during the [Set CustomerGroupAssignments](ctp:api:type:CustomerSetCustomerGroupAssignmentsAction) update action.
diff --git a/api-specs/api/types/message/payload/CustomerGroupAssignmentAddedMessagePayload.raml b/api-specs/api/types/message/payload/CustomerGroupAssignmentAddedMessagePayload.raml
new file mode 100644
index 000000000..9ef30029f
--- /dev/null
+++ b/api-specs/api/types/message/payload/CustomerGroupAssignmentAddedMessagePayload.raml
@@ -0,0 +1,13 @@
+#%RAML 1.0 DataType
+(package): Message
+type: MessagePayload
+(beta): true
+displayName: CustomerGroupAssignmentAddedMessagePayload
+discriminatorValue: CustomerGroupAssignmentAdded
+description: |
+  Generated after a successful [Add CustomerGroupAssignment](ctp:api:type:CustomerAddCustomerGroupAssignmentAction) update action.
+properties:
+  customerGroupAssignment:
+    type: CustomerGroupAssignment
+    description: |
+      [CustomerGroupAssignment](ctp:api:type:CustomerGroupAssignment) that was added during the [Add CustomerGroupAssignment](ctp:api:type:CustomerAddCustomerGroupAssignmentAction) update action.
diff --git a/api-specs/api/types/message/payload/CustomerGroupAssignmentRemovedMessagePayload.raml b/api-specs/api/types/message/payload/CustomerGroupAssignmentRemovedMessagePayload.raml
new file mode 100644
index 000000000..418199ecb
--- /dev/null
+++ b/api-specs/api/types/message/payload/CustomerGroupAssignmentRemovedMessagePayload.raml
@@ -0,0 +1,13 @@
+#%RAML 1.0 DataType
+(package): Message
+type: MessagePayload
+(beta): true
+displayName: CustomerGroupAssignmentRemovedMessagePayload
+discriminatorValue: CustomerGroupAssignmentRemoved
+description: |
+  Generated after a successful [Remove CustomerGroupAssignment](ctp:api:type:CustomerRemoveCustomerGroupAssignmentAction) update action.
+properties:
+  customerGroupAssignment:
+    type: CustomerGroupReference
+    description: |
+      [CustomerGroupAssignment](ctp:api:type:CustomerGroupAssignment) that was removed during the [Remove CustomerGroupAssignment](ctp:api:type:CustomerRemoveCustomerGroupAssignmentAction) update action.
diff --git a/api-specs/api/types/message/payload/CustomerGroupAssignmentsSetMessagePayload.raml b/api-specs/api/types/message/payload/CustomerGroupAssignmentsSetMessagePayload.raml
new file mode 100644
index 000000000..52da0f8b0
--- /dev/null
+++ b/api-specs/api/types/message/payload/CustomerGroupAssignmentsSetMessagePayload.raml
@@ -0,0 +1,13 @@
+#%RAML 1.0 DataType
+(package): Message
+type: MessagePayload
+(beta): true
+displayName: CustomerGroupAssignmentsSetMessagePayload
+discriminatorValue: CustomerGroupAssignmentsSet
+description: |
+  Generated after a successful [Set CustomerGroupAssignments](ctp:api:type:CustomerSetCustomerGroupAssignmentsAction) update action.
+properties:
+  customerGroupAssignments?:
+    type: CustomerGroupAssignment[]
+    description: |
+      List of [CustomerGroupAssignments](ctp:api:type:CustomerGroupAssignment) that were set during the [Set CustomerGroupAssignments](ctp:api:type:CustomerSetCustomerGroupAssignmentsAction) update action.
diff --git a/api-specs/api/types/types.raml b/api-specs/api/types/types.raml
index 3f0f89d16..9dbc69322 100644
--- a/api-specs/api/types/types.raml
+++ b/api-specs/api/types/types.raml
@@ -420,6 +420,8 @@ CustomerCreatePasswordResetToken: !include customer/CustomerCreatePasswordResetT
 CustomerDraft: !include customer/CustomerDraft.raml
 CustomerEmailTokenReference: !include customer/CustomerEmailTokenReference.raml
 CustomerEmailVerify: !include customer/CustomerEmailVerify.raml
+CustomerGroupAssignment: !include customer/CustomerGroupAssignment.raml
+CustomerGroupAssignmentDraft: !include customer/CustomerGroupAssignmentDraft.raml
 CustomerPagedQueryResponse: !include customer/CustomerPagedQueryResponse.raml
 CustomerPasswordTokenReference: !include customer/CustomerPasswordTokenReference.raml
 CustomerReference: !include customer/CustomerReference.raml
@@ -436,12 +438,14 @@ MyCustomerResetPassword: !include customer/MyCustomerResetPassword.raml
 MyCustomerSignin: !include customer/MyCustomerSignin.raml
 CustomerAddAddressAction: !include customer/updates/CustomerAddAddressAction.raml
 CustomerAddBillingAddressIdAction: !include customer/updates/CustomerAddBillingAddressIdAction.raml
+CustomerAddCustomerGroupAssignmentAction: !include customer/updates/CustomerAddCustomerGroupAssignmentAction.raml
 CustomerAddShippingAddressIdAction: !include customer/updates/CustomerAddShippingAddressIdAction.raml
 CustomerAddStoreAction: !include customer/updates/CustomerAddStoreAction.raml
 CustomerChangeAddressAction: !include customer/updates/CustomerChangeAddressAction.raml
 CustomerChangeEmailAction: !include customer/updates/CustomerChangeEmailAction.raml
 CustomerRemoveAddressAction: !include customer/updates/CustomerRemoveAddressAction.raml
 CustomerRemoveBillingAddressIdAction: !include customer/updates/CustomerRemoveBillingAddressIdAction.raml
+CustomerRemoveCustomerGroupAssignmentAction: !include customer/updates/CustomerRemoveCustomerGroupAssignmentAction.raml
 CustomerRemoveShippingAddressIdAction: !include customer/updates/CustomerRemoveShippingAddressIdAction.raml
 CustomerRemoveStoreAction: !include customer/updates/CustomerRemoveStoreAction.raml
 CustomerSetAddressCustomFieldAction: !include customer/updates/CustomerSetAddressCustomFieldAction.raml
@@ -451,6 +455,7 @@ CustomerSetCompanyNameAction: !include customer/updates/CustomerSetCompanyNameAc
 CustomerSetCustomFieldAction: !include customer/updates/CustomerSetCustomFieldAction.raml
 CustomerSetCustomTypeAction: !include customer/updates/CustomerSetCustomTypeAction.raml
 CustomerSetCustomerGroupAction: !include customer/updates/CustomerSetCustomerGroupAction.raml
+CustomerSetCustomerGroupAssignmentsAction: !include customer/updates/CustomerSetCustomerGroupAssignmentsAction.raml
 CustomerSetCustomerNumberAction: !include customer/updates/CustomerSetCustomerNumberAction.raml
 CustomerSetDateOfBirthAction: !include customer/updates/CustomerSetDateOfBirthAction.raml
 CustomerSetDefaultBillingAddressAction: !include customer/updates/CustomerSetDefaultBillingAddressAction.raml
@@ -903,6 +908,9 @@ CustomerEmailChangedMessage: !include message/CustomerEmailChangedMessage.raml
 CustomerEmailTokenCreatedMessage: !include message/CustomerEmailTokenCreatedMessage.raml
 CustomerEmailVerifiedMessage: !include message/CustomerEmailVerifiedMessage.raml
 CustomerFirstNameSetMessage: !include message/CustomerFirstNameSetMessage.raml
+CustomerGroupAssignmentAddedMessage: !include message/CustomerGroupAssignmentAddedMessage.raml
+CustomerGroupAssignmentRemovedMessage: !include message/CustomerGroupAssignmentRemovedMessage.raml
+CustomerGroupAssignmentsSetMessage: !include message/CustomerGroupAssignmentsSetMessage.raml
 CustomerGroupCustomFieldAddedMessage: !include message/CustomerGroupCustomFieldAddedMessage.raml
 CustomerGroupCustomFieldChangedMessage: !include message/CustomerGroupCustomFieldChangedMessage.raml
 CustomerGroupCustomFieldRemovedMessage: !include message/CustomerGroupCustomFieldRemovedMessage.raml
@@ -1161,6 +1169,9 @@ CustomerEmailChangedMessagePayload: !include message/payload/CustomerEmailChange
 CustomerEmailTokenCreatedMessagePayload: !include message/payload/CustomerEmailTokenCreatedMessagePayload.raml
 CustomerEmailVerifiedMessagePayload: !include message/payload/CustomerEmailVerifiedMessagePayload.raml
 CustomerFirstNameSetMessagePayload: !include message/payload/CustomerFirstNameSetMessagePayload.raml
+CustomerGroupAssignmentAddedMessagePayload: !include message/payload/CustomerGroupAssignmentAddedMessagePayload.raml
+CustomerGroupAssignmentRemovedMessagePayload: !include message/payload/CustomerGroupAssignmentRemovedMessagePayload.raml
+CustomerGroupAssignmentsSetMessagePayload: !include message/payload/CustomerGroupAssignmentsSetMessagePayload.raml
 CustomerGroupCustomFieldAddedMessagePayload: !include message/payload/CustomerGroupCustomFieldAddedMessagePayload.raml
 # yamllint disable-line rule:line-length
 CustomerGroupCustomFieldChangedMessagePayload: !include message/payload/CustomerGroupCustomFieldChangedMessagePayload.raml