diff --git a/swagger/paths/application/contacts/merge.yml b/swagger/paths/application/contacts/merge.yml
new file mode 100644
index 000000000..2c5057837
--- /dev/null
+++ b/swagger/paths/application/contacts/merge.yml
@@ -0,0 +1,55 @@
+tags:
+  - Contacts
+operationId: contactMerge
+summary: Merge Contacts
+security:
+  - userApiKey: []
+description: |
+  Merge two contacts into a single contact. The base contact remains and receives all
+  data from the mergee contact. After the merge, the mergee contact is permanently deleted.
+
+  This action is irreversible. All conversations, labels, and custom attributes from the
+  mergee contact will be moved to the base contact.
+requestBody:
+  required: true
+  content:
+    application/json:
+      schema:
+        type: object
+        required:
+          - base_contact_id
+          - mergee_contact_id
+        properties:
+          base_contact_id:
+            type: integer
+            description: ID of the contact that will remain after the merge and receive all data
+            example: 1
+          mergee_contact_id:
+            type: integer
+            description: ID of the contact that will be merged into the base contact and deleted
+            example: 2
+responses:
+  '200':
+    description: Contacts merged successfully
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/contact_base'
+  '400':
+    description: Bad request - invalid contact IDs or contacts cannot be merged
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'
+  '401':
+    description: Unauthorized
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'
+  '404':
+    description: One or both contacts not found
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'
diff --git a/swagger/paths/index.yml b/swagger/paths/index.yml
index d5126a8d1..9d6ee2430 100644
--- a/swagger/paths/index.yml
+++ b/swagger/paths/index.yml
@@ -275,6 +275,12 @@
 /api/v1/accounts/{account_id}/contacts/{id}/contactable_inboxes:
   $ref: ./application/contactable_inboxes/get.yml
 
+# Contact Merge
+/api/v1/accounts/{account_id}/actions/contact_merge:
+  parameters:
+    - $ref: '#/components/parameters/account_id'
+  post:
+    $ref: ./application/contacts/merge.yml
 
 # Automation Rule
 /api/v1/accounts/{account_id}/automation_rules:
diff --git a/swagger/swagger.json b/swagger/swagger.json
index 8d539c259..c210ba716 100644
--- a/swagger/swagger.json
+++ b/swagger/swagger.json
@@ -3424,6 +3424,94 @@
         }
       }
     },
+    "/api/v1/accounts/{account_id}/actions/contact_merge": {
+      "parameters": [
+        {
+          "$ref": "#/components/parameters/account_id"
+        }
+      ],
+      "post": {
+        "tags": [
+          "Contacts"
+        ],
+        "operationId": "contactMerge",
+        "summary": "Merge Contacts",
+        "security": [
+          {
+            "userApiKey": []
+          }
+        ],
+        "description": "Merge two contacts into a single contact. The base contact remains and receives all\ndata from the mergee contact. After the merge, the mergee contact is permanently deleted.\n\nThis action is irreversible. All conversations, labels, and custom attributes from the\nmergee contact will be moved to the base contact.\n",
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object",
+                "required": [
+                  "base_contact_id",
+                  "mergee_contact_id"
+                ],
+                "properties": {
+                  "base_contact_id": {
+                    "type": "integer",
+                    "description": "ID of the contact that will remain after the merge and receive all data",
+                    "example": 1
+                  },
+                  "mergee_contact_id": {
+                    "type": "integer",
+                    "description": "ID of the contact that will be merged into the base contact and deleted",
+                    "example": 2
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Contacts merged successfully",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/contact_base"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "Bad request - invalid contact IDs or contacts cannot be merged",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/bad_request_error"
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Unauthorized",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/bad_request_error"
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "One or both contacts not found",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/bad_request_error"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
     "/api/v1/accounts/{account_id}/automation_rules": {
       "parameters": [
         {
diff --git a/swagger/tag_groups/application_swagger.json b/swagger/tag_groups/application_swagger.json
index 2fd0cbdee..59849ea5a 100644
--- a/swagger/tag_groups/application_swagger.json
+++ b/swagger/tag_groups/application_swagger.json
@@ -1967,6 +1967,94 @@
         }
       }
     },
+    "/api/v1/accounts/{account_id}/actions/contact_merge": {
+      "parameters": [
+        {
+          "$ref": "#/components/parameters/account_id"
+        }
+      ],
+      "post": {
+        "tags": [
+          "Contacts"
+        ],
+        "operationId": "contactMerge",
+        "summary": "Merge Contacts",
+        "security": [
+          {
+            "userApiKey": []
+          }
+        ],
+        "description": "Merge two contacts into a single contact. The base contact remains and receives all\ndata from the mergee contact. After the merge, the mergee contact is permanently deleted.\n\nThis action is irreversible. All conversations, labels, and custom attributes from the\nmergee contact will be moved to the base contact.\n",
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object",
+                "required": [
+                  "base_contact_id",
+                  "mergee_contact_id"
+                ],
+                "properties": {
+                  "base_contact_id": {
+                    "type": "integer",
+                    "description": "ID of the contact that will remain after the merge and receive all data",
+                    "example": 1
+                  },
+                  "mergee_contact_id": {
+                    "type": "integer",
+                    "description": "ID of the contact that will be merged into the base contact and deleted",
+                    "example": 2
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Contacts merged successfully",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/contact_base"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "Bad request - invalid contact IDs or contacts cannot be merged",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/bad_request_error"
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Unauthorized",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/bad_request_error"
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "One or both contacts not found",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/bad_request_error"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
     "/api/v1/accounts/{account_id}/automation_rules": {
       "parameters": [
         {