diff --git a/api/src/api/opportunities_v1/opportunity_routes.py b/api/src/api/opportunities_v1/opportunity_routes.py
index c72e49133..e4c165534 100644
--- a/api/src/api/opportunities_v1/opportunity_routes.py
+++ b/api/src/api/opportunities_v1/opportunity_routes.py
@@ -1,15 +1,19 @@
 import logging
 
+from flask import Response
+
 import src.adapters.db as db
 import src.adapters.db.flask_db as flask_db
 import src.adapters.search as search
 import src.adapters.search.flask_opensearch as flask_opensearch
 import src.api.opportunities_v1.opportunity_schemas as opportunity_schemas
 import src.api.response as response
+import src.util.datetime_util as datetime_util
 from src.api.opportunities_v1.opportunity_blueprint import opportunity_blueprint
 from src.auth.api_key_auth import api_key_auth
 from src.logging.flask_logger import add_extra_data_to_current_request_logs
 from src.services.opportunities_v1.get_opportunity import get_opportunity
+from src.services.opportunities_v1.opportunity_to_csv import opportunity_to_csv
 from src.services.opportunities_v1.search_opportunities import search_opportunities
 from src.util.dict_util import flatten_dict
 
@@ -74,6 +78,21 @@
             },
         },
     },
+    "example4": {
+        "summary": "CSV file response",
+        "value": {
+            "format": "csv",
+            "filters": {
+                "opportunity_status": {"one_of": ["forecasted", "posted"]},
+            },
+            "pagination": {
+                "order_by": "opportunity_id",
+                "page_offset": 1,
+                "page_size": 100,
+                "sort_direction": "ascending",
+            },
+        },
+    },
 }
 
 
@@ -85,11 +104,16 @@
 )
 @opportunity_blueprint.output(opportunity_schemas.OpportunitySearchResponseV1Schema())
 @opportunity_blueprint.auth_required(api_key_auth)
-@opportunity_blueprint.doc(description=SHARED_ALPHA_DESCRIPTION)
+@opportunity_blueprint.doc(
+    description=SHARED_ALPHA_DESCRIPTION,
+    # This adds a file response schema
+    # in addition to the one added by the output decorator
+    responses={200: {"content": {"application/octet-stream": {}}}},  # type: ignore
+)
 @flask_opensearch.with_search_client()
 def opportunity_search(
     search_client: search.SearchClient, search_params: dict
-) -> response.ApiResponse:
+) -> response.ApiResponse | Response:
     add_extra_data_to_current_request_logs(flatten_dict(search_params, prefix="request.body"))
     logger.info("POST /v1/opportunities/search")
 
@@ -105,6 +129,18 @@ def opportunity_search(
     )
     logger.info("Successfully fetched opportunities")
 
+    if search_params.get("format") == opportunity_schemas.SearchResponseFormat.CSV:
+        # Convert the response into a CSV and return the contents
+        output = opportunity_to_csv(opportunities)
+        timestamp = datetime_util.utcnow().strftime("%Y%m%d-%H%M%S")
+        return Response(
+            output.getvalue().encode("utf-8"),
+            content_type="text/csv",
+            headers={
+                "Content-Disposition": f"attachment; filename=opportunity_search_results_{timestamp}.csv"
+            },
+        )
+
     return response.ApiResponse(
         message="Success",
         data=opportunities,
diff --git a/api/src/api/opportunities_v1/opportunity_schemas.py b/api/src/api/opportunities_v1/opportunity_schemas.py
index 76d1a9cb0..6bd5ad9e2 100644
--- a/api/src/api/opportunities_v1/opportunity_schemas.py
+++ b/api/src/api/opportunities_v1/opportunity_schemas.py
@@ -1,3 +1,5 @@
+from enum import StrEnum
+
 from src.api.schemas.extension import Schema, fields, validators
 from src.api.schemas.response_schema import AbstractResponseSchema, PaginationMixinSchema
 from src.api.schemas.search_schema import StrSearchSchemaBuilder
@@ -11,6 +13,11 @@
 from src.pagination.pagination_schema import generate_pagination_schema
 
 
+class SearchResponseFormat(StrEnum):
+    JSON = "json"
+    CSV = "csv"
+
+
 class OpportunitySummaryV1Schema(Schema):
     summary_description = fields.String(
         allow_none=True,
@@ -204,6 +211,9 @@ class OpportunitySummaryV1Schema(Schema):
     funding_categories = fields.List(fields.Enum(FundingCategory))
     applicant_types = fields.List(fields.Enum(ApplicantType))
 
+    created_at = fields.DateTime(metadata={"description": "TODO"})
+    updated_at = fields.DateTime(metadata={"description": "TODO"})
+
 
 class OpportunityAssistanceListingV1Schema(Schema):
     program_title = fields.String(
@@ -378,6 +388,15 @@ class OpportunitySearchRequestV1Schema(Schema):
         required=True,
     )
 
+    format = fields.Enum(
+        SearchResponseFormat,
+        load_default=SearchResponseFormat.JSON,
+        metadata={
+            "description": "The format of the response",
+            "default": SearchResponseFormat.JSON,
+        },
+    )
+
 
 class OpportunityGetResponseV1Schema(AbstractResponseSchema):
     data = fields.Nested(OpportunityV1Schema())
diff --git a/api/src/services/opportunities_v1/opportunity_to_csv.py b/api/src/services/opportunities_v1/opportunity_to_csv.py
new file mode 100644
index 000000000..8be6f6c0d
--- /dev/null
+++ b/api/src/services/opportunities_v1/opportunity_to_csv.py
@@ -0,0 +1,93 @@
+import csv
+import io
+from typing import Sequence
+
+from src.util.dict_util import flatten_dict
+
+CSV_FIELDS = [
+    "opportunity_id",
+    "opportunity_number",
+    "opportunity_title",
+    "opportunity_status",
+    "agency",
+    "category",
+    "category_explanation",
+    "post_date",
+    "close_date",
+    "close_date_description",
+    "archive_date",
+    "is_cost_sharing",
+    "expected_number_of_awards",
+    "estimated_total_program_funding",
+    "award_floor",
+    "award_ceiling",
+    "additional_info_url",
+    "additional_info_url_description",
+    "opportunity_assistance_listings",
+    "funding_instruments",
+    "funding_categories",
+    "funding_category_description",
+    "applicant_types",
+    "applicant_eligibility_description",
+    "agency_code",
+    "agency_name",
+    "agency_phone_number",
+    "agency_contact_description",
+    "agency_email_address",
+    "agency_email_address_description",
+    "is_forecast",
+    "forecasted_post_date",
+    "forecasted_close_date",
+    "forecasted_close_date_description",
+    "forecasted_award_date",
+    "forecasted_project_start_date",
+    "fiscal_year",
+    "created_at",
+    "updated_at",
+    # We put the description at the end as it's the longest value
+    # which can help improve readability of other fields
+    "summary_description",
+]
+# Same as above, but faster lookup
+CSV_FIELDS_SET = set(CSV_FIELDS)
+
+
+def _process_assistance_listing(assistance_listings: list[dict]) -> str:
+    return ";".join(
+        [f"{a['assistance_listing_number']}|{a['program_title']}" for a in assistance_listings]
+    )
+
+
+def opportunity_to_csv(opportunities: Sequence[dict]) -> io.StringIO:
+    opportunities_to_write: list[dict] = []
+
+    for opportunity in opportunities:
+        opp = flatten_dict(opportunity)
+
+        out_opportunity = {}
+        for k, v in opp.items():
+            # Remove prefixes from nested data structures
+            k = k.removeprefix("summary.")
+            k = k.removeprefix("assistance_listings.")
+
+            # Remove fields we haven't configured
+            if k not in CSV_FIELDS_SET:
+                continue
+
+            if k == "opportunity_assistance_listings":
+                v = _process_assistance_listing(v)
+
+            if k in ["funding_instruments", "funding_categories", "applicant_types"]:
+                v = ";".join(v)
+
+            out_opportunity[k] = v
+
+        opportunities_to_write.append(out_opportunity)
+
+    output = io.StringIO()
+
+    writer = csv.DictWriter(output, fieldnames=CSV_FIELDS, quoting=csv.QUOTE_ALL)
+    writer.writeheader()
+    writer.writerows(opportunities_to_write)
+
+    return output
diff --git a/api/src/services/opportunities_v1/search_opportunities.py b/api/src/services/opportunities_v1/search_opportunities.py
index 92a71344c..e3252e90e 100644
--- a/api/src/services/opportunities_v1/search_opportunities.py
+++ b/api/src/services/opportunities_v1/search_opportunities.py
@@ -83,10 +83,10 @@ def _add_search_filters(builder: search.SearchQueryBuilder, filters: dict | None
 def _add_aggregations(builder: search.SearchQueryBuilder) -> None:
     # TODO - we'll likely want to adjust the total number of values returned, especially
     # for agency as there could be hundreds of different agencies, and currently it's limited to 25.
-    builder.aggregation_terms("opportunity_status", _adjust_field_name("applicant_types"))
-    builder.aggregation_terms("applicant_type", _adjust_field_name("applicant_types"))
-    builder.aggregation_terms("funding_instrument", _adjust_field_name("funding_instruments"))
-    builder.aggregation_terms("funding_category", _adjust_field_name("funding_categories"))
+    builder.aggregation_terms("opportunity_status", _adjust_field_name("applicant_type"))
+    builder.aggregation_terms("applicant_type", _adjust_field_name("applicant_type"))
+    builder.aggregation_terms("funding_instrument", _adjust_field_name("funding_instrument"))
+    builder.aggregation_terms("funding_category", _adjust_field_name("funding_category"))
     builder.aggregation_terms("agency", _adjust_field_name("agency_code"))
 
 
diff --git a/api/tests/src/api/opportunities_v1/conftest.py b/api/tests/src/api/opportunities_v1/conftest.py
index c1babc7ba..5d0a9eaf4 100644
--- a/api/tests/src/api/opportunities_v1/conftest.py
+++ b/api/tests/src/api/opportunities_v1/conftest.py
@@ -22,6 +22,7 @@ def get_search_request(
     applicant_type_one_of: list[ApplicantType] | None = None,
     opportunity_status_one_of: list[OpportunityStatus] | None = None,
     agency_one_of: list[str] | None = None,
+    format: str | None = None,
 ):
     req = {
         "pagination": {
@@ -55,6 +56,9 @@ def get_search_request(
     if query is not None:
         req["query"] = query
 
+    if format is not None:
+        req["format"] = format
+
     return req
 
 
diff --git a/api/tests/src/api/opportunities_v1/test_opportunity_route_search.py b/api/tests/src/api/opportunities_v1/test_opportunity_route_search.py
index e3becbfb3..f889d6390 100644
--- a/api/tests/src/api/opportunities_v1/test_opportunity_route_search.py
+++ b/api/tests/src/api/opportunities_v1/test_opportunity_route_search.py
@@ -1,3 +1,4 @@
+import csv
 from datetime import date
 
 import pytest
@@ -23,22 +24,42 @@
 
 
 def validate_search_response(
-    search_response, expected_results: list[Opportunity], expected_status_code: int = 200
+    search_response,
+    expected_results: list[Opportunity],
+    expected_status_code: int = 200,
+    is_csv_response: bool = False,
 ):
     assert search_response.status_code == expected_status_code
 
-    response_json = search_response.get_json()
+    expected_ids = [exp.opportunity_id for exp in expected_results]
 
-    opportunities = response_json["data"]
+    if is_csv_response:
+        reader = csv.DictReader(search_response.text.split("\n"))
+        opportunities = [record for record in reader]
+    else:
+        response_json = search_response.get_json()
+        opportunities = response_json["data"]
 
-    response_ids = [opp["opportunity_id"] for opp in opportunities]
-    expected_ids = [exp.opportunity_id for exp in expected_results]
+    response_ids = [int(opp["opportunity_id"]) for opp in opportunities]
 
     assert (
         response_ids == expected_ids
     ), f"Actual opportunities:\n {'\n'.join([opp['opportunity_title'] for opp in opportunities])}"
 
 
+def call_search_and_validate(client, api_auth_token, search_request, expected_results):
+    resp = client.post(
+        "/v1/opportunities/search", json=search_request, headers={"X-Auth": api_auth_token}
+    )
+    validate_search_response(resp, expected_results)
+
+    search_request["format"] = "csv"
+    resp = client.post(
+        "/v1/opportunities/search", json=search_request, headers={"X-Auth": api_auth_token}
+    )
+    validate_search_response(resp, expected_results, is_csv_response=True)
+
+
 def build_opp(
     opportunity_title: str,
     opportunity_number: str,
@@ -470,10 +491,7 @@ def setup_search_data(self, opportunity_index, opportunity_index_alias, search_c
     def test_sorting_and_pagination_200(
         self, client, api_auth_token, setup_search_data, search_request, expected_results
     ):
-        resp = client.post(
-            "/v1/opportunities/search", json=search_request, headers={"X-Auth": api_auth_token}
-        )
-        validate_search_response(resp, expected_results)
+        call_search_and_validate(client, api_auth_token, search_request, expected_results)
 
     @pytest.mark.parametrize(
         "search_request, expected_results",
@@ -690,10 +708,7 @@ def test_sorting_and_pagination_200(
     def test_search_filters_200(
         self, client, api_auth_token, setup_search_data, search_request, expected_results
     ):
-        resp = client.post(
-            "/v1/opportunities/search", json=search_request, headers={"X-Auth": api_auth_token}
-        )
-        validate_search_response(resp, expected_results)
+        call_search_and_validate(client, api_auth_token, search_request, expected_results)
 
     @pytest.mark.parametrize(
         "search_request, expected_results",
@@ -758,7 +773,4 @@ def test_search_query_200(
     ):
         # This test isn't looking to validate opensearch behavior, just that we've connected fields properly and
         # results being returned are as expected.
-        resp = client.post(
-            "/v1/opportunities/search", json=search_request, headers={"X-Auth": api_auth_token}
-        )
-        validate_search_response(resp, expected_results)
+        call_search_and_validate(client, api_auth_token, search_request, expected_results)
diff --git a/api/tests/src/db/models/factories.py b/api/tests/src/db/models/factories.py
index 624a80a5c..3fb784d43 100644
--- a/api/tests/src/db/models/factories.py
+++ b/api/tests/src/db/models/factories.py
@@ -94,7 +94,7 @@ class CustomProvider(BaseProvider):
     AGENCY_CONTACT_DESC_FORMATS = [
         "{{name}}\n{{job}}\n555-###-####\n{{email}}",
         "{{relevant_url}} Contact Center\nHours of operation are 24 hours a day, 7 days a week.\n{{email}}",
-        "{{agency}} Webmaster\n{{email}}",
+        "Webmaster\n{{email}}",
     ]
 
     # Rather than generate any random URL in our data, use those
@@ -367,7 +367,7 @@ class Meta:
         no_declaration=None,
     )
 
-    agency_code = factory.Faker("agency")
+    agency_code = factory.LazyAttribute(lambda s: s.opportunity.agency)
     agency_name = factory.Faker("agency_name")
     agency_phone_number = Generators.PhoneNumber
     agency_contact_description = factory.Faker("agency_contact_description")
@@ -438,6 +438,11 @@ class Meta:
         unique=True,
     )
 
+    created_at = factory.Faker("date_time")
+    updated_at = factory.LazyAttribute(
+        lambda o: fake.date_time_between(start_date=o.created_at, end_date="now")
+    )
+
     class Params:
         # These are common overrides we might want for an opportunity summary.
         # Simply pass the in `trait_name=True` to the factory when making an object