diff --git a/docs/openapi.json b/docs/openapi.json
index 01009626..1e6970b0 100644
--- a/docs/openapi.json
+++ b/docs/openapi.json
@@ -1242,6 +1242,216 @@
         "summary": "Requests a new access token for the authenticated user."
       }
     },
+    "/api/users/shared-with-you": {
+      "get": {
+        "description": "This resource provides information about users that shared workflow(s) with the authenticated user.",
+        "operationId": "get_users_shared_with_you",
+        "parameters": [
+          {
+            "description": "API access_token of user.",
+            "in": "query",
+            "name": "access_token",
+            "required": false,
+            "type": "string"
+          }
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "Users that shared workflow(s) with the authenticated user.",
+            "examples": {
+              "application/json": {
+                "users_shared_with_you": [
+                  {
+                    "email": "john.doe@example.org",
+                    "full_name": "John Doe",
+                    "username": "jdoe"
+                  }
+                ]
+              }
+            },
+            "schema": {
+              "properties": {
+                "users": {
+                  "items": {
+                    "properties": {
+                      "email": {
+                        "type": "string"
+                      },
+                      "full_name": {
+                        "type": "string"
+                      },
+                      "username": {
+                        "type": "string"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "401": {
+            "description": "Error message indicating that the uses is not authenticated.",
+            "examples": {
+              "application/json": {
+                "message": "User not logged in"
+              }
+            },
+            "schema": {
+              "properties": {
+                "message": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "403": {
+            "description": "Request failed. User token not valid.",
+            "examples": {
+              "application/json": {
+                "message": "Token is not valid."
+              }
+            },
+            "schema": {
+              "properties": {
+                "message": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "500": {
+            "description": "Request failed. Internal server error.",
+            "examples": {
+              "application/json": {
+                "message": "Internal server error."
+              }
+            },
+            "schema": {
+              "properties": {
+                "message": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          }
+        },
+        "summary": "Gets users that shared workflow(s) with the authenticated user."
+      }
+    },
+    "/api/users/you-shared-with": {
+      "get": {
+        "description": "This resource provides information about users that the authenticated user shared workflow(s) with.",
+        "operationId": "get_users_you_shared_with",
+        "parameters": [
+          {
+            "description": "API access_token of user.",
+            "in": "query",
+            "name": "access_token",
+            "required": false,
+            "type": "string"
+          }
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "Users that the authenticated user shared workflow(s) with.",
+            "examples": {
+              "application/json": {
+                "users_you_shared_with": [
+                  {
+                    "email": "john.doe@example.org",
+                    "full_name": "John Doe",
+                    "username": "jdoe"
+                  }
+                ]
+              }
+            },
+            "schema": {
+              "properties": {
+                "users": {
+                  "items": {
+                    "properties": {
+                      "email": {
+                        "type": "string"
+                      },
+                      "full_name": {
+                        "type": "string"
+                      },
+                      "username": {
+                        "type": "string"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "401": {
+            "description": "Error message indicating that the uses is not authenticated.",
+            "examples": {
+              "application/json": {
+                "message": "User not logged in"
+              }
+            },
+            "schema": {
+              "properties": {
+                "message": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "403": {
+            "description": "Request failed. User token not valid.",
+            "examples": {
+              "application/json": {
+                "message": "Token is not valid."
+              }
+            },
+            "schema": {
+              "properties": {
+                "message": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          },
+          "500": {
+            "description": "Request failed. Internal server error.",
+            "examples": {
+              "application/json": {
+                "message": "Internal server error."
+              }
+            },
+            "schema": {
+              "properties": {
+                "message": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            }
+          }
+        },
+        "summary": "Gets users that the authenticated user shared workflow(s) with."
+      }
+    },
     "/api/workflows": {
       "get": {
         "description": "This resource return all current workflows in JSON format.",
diff --git a/reana_server/rest/users.py b/reana_server/rest/users.py
index 69290650..f259601f 100644
--- a/reana_server/rest/users.py
+++ b/reana_server/rest/users.py
@@ -13,7 +13,8 @@
 
 from bravado.exception import HTTPError
 from flask import Blueprint, jsonify
-from reana_db.models import AuditLogAction
+from reana_db.database import Session
+from reana_db.models import AuditLogAction, User, UserWorkflow, Workflow
 from reana_commons.config import (
     REANA_COMPONENT_PREFIX,
     REANA_INFRASTRUCTURE_KUBERNETES_NAMESPACE,
@@ -354,3 +355,265 @@ def request_token(user):
     except Exception as e:
         logging.error(traceback.format_exc())
         return jsonify({"message": str(e)}), 500
+
+
+@blueprint.route("/users/shared-with-you", methods=["GET"])
+@signin_required()
+def get_users_shared_with_you(user):
+    r"""Endpoint to get users that shared workflow(s) with the authenticated user.
+
+    ---
+    get:
+      summary: Gets users that shared workflow(s) with the authenticated user.
+      description: >-
+        This resource provides information about users that shared
+        workflow(s) with the authenticated user.
+      operationId: get_users_shared_with_you
+      produces:
+        - application/json
+      parameters:
+        - name: access_token
+          in: query
+          description: API access_token of user.
+          required: false
+          type: string
+      responses:
+        200:
+          description: >-
+            Users that shared workflow(s) with the authenticated user.
+          schema:
+            type: object
+            properties:
+              users:
+                type: array
+                items:
+                  type: object
+                  properties:
+                    email:
+                      type: string
+                    full_name:
+                      type: string
+                    username:
+                      type: string
+          examples:
+            application/json:
+              {
+                "users_shared_with_you": [
+                  {
+                    "email": "john.doe@example.org",
+                    "full_name": "John Doe",
+                    "username": "jdoe"
+                    }
+                ]
+            }
+        401:
+          description: >-
+            Error message indicating that the uses is not authenticated.
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+          examples:
+            application/json:
+              {
+                "message": "User not logged in"
+              }
+        403:
+          description: >-
+            Request failed. User token not valid.
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+          examples:
+            application/json:
+              {
+                "message": "Token is not valid."
+              }
+        500:
+          description: >-
+            Request failed. Internal server error.
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+          examples:
+            application/json:
+              {
+                "message": "Internal server error."
+              }
+    """
+    try:
+        shared_workflows_ids = (
+            Session.query(UserWorkflow.workflow_id)
+            .filter(UserWorkflow.user_id == user.id_)
+            .subquery()
+        )
+
+        shared_workflow_owners_ids = (
+            Session.query(Workflow.owner_id)
+            .filter(Workflow.id_.in_(shared_workflows_ids))
+            .distinct()
+            .subquery()
+        )
+
+        users = (
+            Session.query(User.email, User.full_name, User.username)
+            .filter(User.id_.in_(shared_workflow_owners_ids))
+            .all()
+        )
+
+        response = {"users_shared_with_you": []}
+
+        for email, full_name, username in users:
+            response["users_shared_with_you"].append(
+                {
+                    "email": email,
+                    "full_name": full_name,
+                    "username": username,
+                }
+            )
+
+        return jsonify(response), 200
+    except HTTPError as e:
+        logging.error(traceback.format_exc())
+        return jsonify(e.response.json()), e.response.status_code
+    except ValueError as e:
+        logging.error(traceback.format_exc())
+        return jsonify({"message": str(e)}), 403
+    except Exception as e:
+        logging.error(traceback.format_exc())
+        return jsonify({"message": str(e)}), 500
+
+
+@blueprint.route("/users/you-shared-with", methods=["GET"])
+@signin_required()
+def get_users_you_shared_with(user):
+    r"""Endpoint to get users that the authenticated user shared workflow(s) with.
+
+    ---
+    get:
+      summary: Gets users that the authenticated user shared workflow(s) with.
+      description: >-
+        This resource provides information about users that the authenticated user
+        shared workflow(s) with.
+      operationId: get_users_you_shared_with
+      produces:
+        - application/json
+      parameters:
+        - name: access_token
+          in: query
+          description: API access_token of user.
+          required: false
+          type: string
+      responses:
+        200:
+          description: >-
+            Users that the authenticated user shared workflow(s) with.
+          schema:
+            type: object
+            properties:
+              users:
+                type: array
+                items:
+                  type: object
+                  properties:
+                    email:
+                      type: string
+                    full_name:
+                      type: string
+                    username:
+                      type: string
+          examples:
+            application/json:
+              {
+                "users_you_shared_with": [
+                  {
+                    "email": "john.doe@example.org",
+                    "full_name": "John Doe",
+                    "username": "jdoe"
+                    }
+                ]
+            }
+        401:
+          description: >-
+            Error message indicating that the uses is not authenticated.
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+          examples:
+            application/json:
+              {
+                "message": "User not logged in"
+              }
+        403:
+          description: >-
+            Request failed. User token not valid.
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+          examples:
+            application/json:
+              {
+                "message": "Token is not valid."
+              }
+        500:
+          description: >-
+            Request failed. Internal server error.
+          schema:
+            type: object
+            properties:
+              message:
+                type: string
+          examples:
+            application/json:
+              {
+                "message": "Internal server error."
+              }
+    """
+    try:
+        owned_workflows_ids = (
+            Session.query(Workflow.id_).filter(Workflow.owner_id == user.id_).subquery()
+        )
+
+        users_you_shared_with_ids = (
+            Session.query(UserWorkflow.user_id)
+            .filter(UserWorkflow.workflow_id.in_(owned_workflows_ids))
+            .distinct()
+            .subquery()
+        )
+
+        users = (
+            Session.query(User.email, User.full_name, User.username)
+            .filter(User.id_.in_(users_you_shared_with_ids))
+            .all()
+        )
+
+        response = {"users_you_shared_with": []}
+
+        for email, full_name, username in users:
+            response["users_you_shared_with"].append(
+                {
+                    "email": email,
+                    "full_name": full_name,
+                    "username": username,
+                }
+            )
+
+        return jsonify(response), 200
+    except HTTPError as e:
+        logging.error(traceback.format_exc())
+        return jsonify(e.response.json()), e.response.status_code
+    except ValueError as e:
+        logging.error(traceback.format_exc())
+        return jsonify({"message": str(e)}), 403
+    except Exception as e:
+        logging.error(traceback.format_exc())
+        return jsonify({"message": str(e)}), 500
diff --git a/tests/test_users.py b/tests/test_users.py
new file mode 100644
index 00000000..f466f3de
--- /dev/null
+++ b/tests/test_users.py
@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of REANA.
+# Copyright (C) 2023 CERN.
+#
+# REANA is free software; you can redistribute it and/or modify it
+# under the terms of the MIT License; see LICENSE file for more details.
+
+"""Test users endpoints."""
+
+
+import pytest
+from flask import url_for
+from mock import patch
+from pytest_reana.test_utils import make_mock_api_client
+
+
+def test_get_users_shared_with_you(app, user1):
+    """Test getting users who shared workflows with you."""
+    with app.test_client() as client:
+        response = client.get(
+            url_for("users.get_users_shared_with_you"),
+        )
+
+        assert response.status_code == 401
+
+        response = client.get(
+            url_for("users.get_users_shared_with_you"),
+            query_string={"access_token": "invalid_token"},
+        )
+
+        assert response.status_code == 403
+
+        response = client.get(
+            url_for("users.get_users_shared_with_you"),
+            query_string={"access_token": user1.access_token},
+        )
+
+        assert response.status_code == 200
+
+
+def test_get_users_you_shared_with(app, user1):
+    """Test getting users who you shared workflows with."""
+    with app.test_client() as client:
+        response = client.get(
+            url_for("users.get_users_you_shared_with"),
+        )
+
+        assert response.status_code == 401
+
+        response = client.get(
+            url_for("users.get_users_you_shared_with"),
+            query_string={"access_token": "invalid_token"},
+        )
+
+        assert response.status_code == 403
+
+        response = client.get(
+            url_for("users.get_users_you_shared_with"),
+            query_string={"access_token": user1.access_token},
+        )
+
+        assert response.status_code == 200