diff --git a/commands/env/add.ts b/commands/env/add.ts
new file mode 100644
index 00000000..c05553c1
--- /dev/null
+++ b/commands/env/add.ts
@@ -0,0 +1,118 @@
+/*
+ * @adonisjs/core
+ *
+ * (c) AdonisJS
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+import { CommandOptions } from '../../types/ace.js'
+import { args, BaseCommand, flags } from '../../modules/ace/main.js'
+import stringHelpers from '../../src/helpers/string.js'
+
+const ALLOWED_TYPES = ['string', 'boolean', 'number', 'enum'] as const
+type AllowedTypes = (typeof ALLOWED_TYPES)[number]
+
+/**
+ * The env:add command is used to add a new environment variable to the
+ * `.env`, `.env.example` and `start/env.ts` files.
+ */
+export default class EnvAdd extends BaseCommand {
+  static commandName = 'env:add'
+  static description = 'Add a new environment variable'
+  static options: CommandOptions = {
+    allowUnknownFlags: true,
+  }
+
+  @args.string({
+    description: 'Variable name. Will be converted to screaming snake case',
+    required: false,
+  })
+  declare name: string
+
+  @args.string({ description: 'Variable value', required: false })
+  declare value: string
+
+  @flags.string({ description: 'Type of the variable' })
+  declare type: AllowedTypes
+
+  @flags.array({
+    description: 'Allowed values for the enum type in a comma-separated list',
+    default: [''],
+    required: false,
+  })
+  declare enumValues: string[]
+
+  /**
+   * Validate the type flag passed by the user
+   */
+  #isTypeFlagValid() {
+    return ALLOWED_TYPES.includes(this.type)
+  }
+
+  async run() {
+    /**
+     * Prompt for missing name
+     */
+    if (!this.name) {
+      this.name = await this.prompt.ask('Enter the variable name', {
+        validate: (value) => !!value,
+        format: (value) => stringHelpers.snakeCase(value).toUpperCase(),
+      })
+    }
+
+    /**
+     * Prompt for missing value
+     */
+    if (!this.value) {
+      this.value = await this.prompt.ask('Enter the variable value')
+    }
+
+    /**
+     * Prompt for missing type
+     */
+    if (!this.type) {
+      this.type = await this.prompt.choice('Select the variable type', ALLOWED_TYPES)
+    }
+
+    /**
+     * Prompt for missing enum values if the selected env type is `enum`
+     */
+    if (this.type === 'enum' && !this.enumValues) {
+      this.enumValues = await this.prompt.ask('Enter the enum values separated by a comma', {
+        result: (value) => value.split(',').map((one) => one.trim()),
+      })
+    }
+
+    /**
+     * Validate inputs
+     */
+    if (!this.#isTypeFlagValid()) {
+      this.logger.error(`Invalid type "${this.type}". Must be one of ${ALLOWED_TYPES.join(', ')}`)
+      return
+    }
+
+    /**
+     * Add the environment variable to the `.env` and `.env.example` files
+     */
+    const codemods = await this.createCodemods()
+    const transformedName = stringHelpers.snakeCase(this.name).toUpperCase()
+
+    await codemods.defineEnvVariables({ [transformedName]: this.value })
+
+    /**
+     * Add the environment variable to the `start/env.ts` file
+     */
+    const validation = {
+      string: 'Env.schema.string()',
+      number: 'Env.schema.number()',
+      boolean: 'Env.schema.boolean()',
+      enum: `Env.schema.enum(['${this.enumValues.join("','")}'] as const)`,
+    }[this.type]
+
+    await codemods.defineEnvValidations({ variables: { [transformedName]: validation } })
+
+    this.logger.success('Environment variable added successfully')
+  }
+}
diff --git a/tests/commands/env_add.spec.ts b/tests/commands/env_add.spec.ts
new file mode 100644
index 00000000..23d0d731
--- /dev/null
+++ b/tests/commands/env_add.spec.ts
@@ -0,0 +1,116 @@
+/*
+ * @adonisjs/core
+ *
+ * (c) AdonisJS
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+import { test } from '@japa/runner'
+import EnvAdd from '../../commands/env/add.js'
+import { AceFactory } from '../../factories/core/ace.js'
+
+test.group('Env Add command', () => {
+  test('add new env variable to the different files', async ({ assert, fs }) => {
+    await fs.createJson('tsconfig.json', {})
+    await fs.create('.env', '')
+    await fs.create('.env.example', '')
+    await fs.create(
+      './start/env.ts',
+      `import { Env } from '@adonisjs/core/env'
+      export default await Env.create(new URL('../', import.meta.url), {})`
+    )
+
+    const ace = await new AceFactory().make(fs.baseUrl)
+    await ace.app.init()
+    ace.ui.switchMode('raw')
+
+    const command = await ace.create(EnvAdd, ['variable', 'value', '--type=string'])
+    await command.exec()
+
+    await assert.fileContains('.env', 'VARIABLE=value')
+    await assert.fileContains('.env.example', 'VARIABLE=value')
+    await assert.fileContains('./start/env.ts', 'VARIABLE: Env.schema.string()')
+  })
+
+  test('convert variable to screaming snake case', async ({ assert, fs }) => {
+    await fs.createJson('tsconfig.json', {})
+    await fs.create('.env', '')
+    await fs.create('.env.example', '')
+    await fs.create(
+      './start/env.ts',
+      `import { Env } from '@adonisjs/core/env'
+      export default await Env.create(new URL('../', import.meta.url), {})`
+    )
+
+    const ace = await new AceFactory().make(fs.baseUrl)
+    await ace.app.init()
+    ace.ui.switchMode('raw')
+
+    const command = await ace.create(EnvAdd, ['stripe_ApiKey', 'value', '--type=string'])
+    await command.exec()
+
+    await assert.fileContains('.env', 'STRIPE_API_KEY=value')
+    await assert.fileContains('.env.example', 'STRIPE_API_KEY=value')
+    await assert.fileContains('./start/env.ts', 'STRIPE_API_KEY: Env.schema.string()')
+  })
+
+  test('enum type with allowed values', async ({ assert, fs }) => {
+    await fs.createJson('tsconfig.json', {})
+    await fs.create('.env', '')
+    await fs.create('.env.example', '')
+    await fs.create(
+      './start/env.ts',
+      `import { Env } from '@adonisjs/core/env'
+      export default await Env.create(new URL('../', import.meta.url), {})`
+    )
+
+    const ace = await new AceFactory().make(fs.baseUrl)
+    await ace.app.init()
+    ace.ui.switchMode('raw')
+
+    const command = await ace.create(EnvAdd, [
+      'variable',
+      'bar',
+      '--type=enum',
+      '--enum-values=foo',
+      '--enum-values=bar',
+    ])
+    await command.exec()
+
+    await assert.fileContains('.env', 'VARIABLE=bar')
+    await assert.fileContains('.env.example', 'VARIABLE=bar')
+    await assert.fileContains(
+      './start/env.ts',
+      "VARIABLE: Env.schema.enum(['foo', 'bar'] as const)"
+    )
+  })
+
+  test('prompt when nothing is passed to the command', async ({ assert, fs }) => {
+    await fs.createJson('tsconfig.json', {})
+    await fs.create('.env', '')
+    await fs.create('.env.example', '')
+    await fs.create(
+      './start/env.ts',
+      `import { Env } from '@adonisjs/core/env'
+      export default await Env.create(new URL('../', import.meta.url), {})`
+    )
+
+    const ace = await new AceFactory().make(fs.baseUrl)
+    await ace.app.init()
+    ace.ui.switchMode('raw')
+
+    const command = await ace.create(EnvAdd, [])
+
+    command.prompt.trap('Enter the variable name').replyWith('my_variable_name')
+    command.prompt.trap('Enter the variable value').replyWith('my_value')
+    command.prompt.trap('Select the variable type').replyWith('string')
+
+    await command.exec()
+
+    await assert.fileContains('.env', 'MY_VARIABLE_NAME=my_value')
+    await assert.fileContains('.env.example', 'MY_VARIABLE_NAME=my_value')
+    await assert.fileContains('./start/env.ts', 'MY_VARIABLE_NAME: Env.schema.string()')
+  })
+})