diff --git a/app/api/bit_extension.py b/app/api/bit_extension.py
index 2ef2304..9b24759 100644
--- a/app/api/bit_extension.py
+++ b/app/api/bit_extension.py
@@ -14,6 +14,9 @@
 api.namespaces.clear()
 
 # Adding namespaces
+from app.api.resources.mentorship_relation import mentorship_relation_ns as mentorship_relation_namespace
+api.add_namespace(mentorship_relation_namespace, path="/")
+
 from app.api.resources.users import users_ns as user_namespace
 api.add_namespace(user_namespace, path="/")
 
diff --git a/app/api/dao/mentorship_relation.py b/app/api/dao/mentorship_relation.py
new file mode 100644
index 0000000..c206f38
--- /dev/null
+++ b/app/api/dao/mentorship_relation.py
@@ -0,0 +1,121 @@
+from datetime import datetime, timedelta
+from typing import Dict
+from http import HTTPStatus
+from app import messages
+from app.database.models.bit_schema.mentorship_relation_extension import MentorshipRelationExtensionModel
+from app.database.models.bit_schema.user_extension import UserExtensionModel
+from app.utils.decorator_utils import email_verification_required
+from app.utils.enum_utils import MentorshipRelationState
+
+
+class MentorshipRelationDAO:
+    """Data Access Object for mentorship relation functionalities.
+
+    Provides various functions pertaining to mentorship.
+
+    Attributes:
+        MAXIMUM_MENTORSHIP_DURATION
+        MINIMUM_MENTORSHIP_DURATION
+    """
+
+    MAXIMUM_MENTORSHIP_DURATION = timedelta(weeks=24)  # 6 months = approximately 6*4
+    MINIMUM_MENTORSHIP_DURATION = timedelta(weeks=4)
+
+    def create_mentorship_relation(self, user_id: int, data: Dict[str, str]):
+        """Creates a relationship between two users.
+
+        Establishes the mentor-mentee relationship.
+
+        Args:
+            user_id: ID of the user initiating this request. Has to be either the mentor or the mentee.
+            data: List containing the mentor_id, mentee_id, end_date_timestamp and notes.
+
+        Returns:
+            message: A message corresponding to the completed action; success if mentorship relationship is established, failure if otherwise.
+        """
+        action_user_id = user_id
+        mentor_id = data["mentor_id"]
+        mentee_id = data["mentee_id"]
+        end_date_timestamp = data["end_date"]
+        notes = data["notes"]
+
+        # user_id has to match either mentee_id or mentor_id
+        is_valid_user_ids = action_user_id == mentor_id or action_user_id == mentee_id
+        if not is_valid_user_ids:
+            return messages.MATCH_EITHER_MENTOR_OR_MENTEE, HTTPStatus.BAD_REQUEST
+
+        # mentor_id has to be different from mentee_id
+        if mentor_id == mentee_id:
+            return messages.MENTOR_ID_SAME_AS_MENTEE_ID, HTTPStatus.BAD_REQUEST
+
+        try:
+            end_date_datetime = datetime.fromtimestamp(end_date_timestamp)
+        except ValueError:
+            return messages.INVALID_END_DATE, HTTPStatus.BAD_REQUEST
+
+        now_datetime = datetime.now()
+        if end_date_datetime < now_datetime:
+            return messages.END_TIME_BEFORE_PRESENT, HTTPStatus.BAD_REQUEST
+
+        # business logic constraints
+
+        max_relation_duration = end_date_datetime - now_datetime
+        if max_relation_duration > self.MAXIMUM_MENTORSHIP_DURATION:
+            return messages.MENTOR_TIME_GREATER_THAN_MAX_TIME, HTTPStatus.BAD_REQUEST
+
+        if max_relation_duration < self.MINIMUM_MENTORSHIP_DURATION:
+            return messages.MENTOR_TIME_LESS_THAN_MIN_TIME, HTTPStatus.BAD_REQUEST
+
+        # validate if mentor user exists
+        mentor_user = UserModel.find_by_id(mentor_id)
+        if mentor_user is None:
+            return messages.MENTOR_DOES_NOT_EXIST, HTTPStatus.NOT_FOUND
+
+        # validate if mentor is available to mentor
+        if not mentor_user.available_to_mentor:
+            return messages.MENTOR_NOT_AVAILABLE_TO_MENTOR, HTTPStatus.BAD_REQUEST
+
+        # validate if mentee user exists
+        mentee_user = UserModel.find_by_id(mentee_id)
+        if mentee_user is None:
+            return messages.MENTEE_DOES_NOT_EXIST, HTTPStatus.NOT_FOUND
+
+        # validate if mentee is wants to be mentored
+        if not mentee_user.need_mentoring:
+            return messages.MENTEE_NOT_AVAIL_TO_BE_MENTORED, HTTPStatus.BAD_REQUEST
+
+        # TODO add tests for this portion
+
+        all_mentor_relations = (
+            mentor_user.mentor_relations + mentor_user.mentee_relations
+        )
+        for relation in all_mentor_relations:
+            if relation.state == MentorshipRelationState.ACCEPTED:
+                return messages.MENTOR_ALREADY_IN_A_RELATION, HTTPStatus.BAD_REQUEST
+
+        all_mentee_relations = (
+            mentee_user.mentor_relations + mentee_user.mentee_relations
+        )
+        for relation in all_mentee_relations:
+            if relation.state == MentorshipRelationState.ACCEPTED:
+                return messages.MENTEE_ALREADY_IN_A_RELATION, HTTPStatus.BAD_REQUEST
+
+        # All validations were checked
+
+        tasks_list = TasksListModel()
+        tasks_list.save_to_db()
+
+        mentorship_relation = MentorshipRelationModel(
+            action_user_id=action_user_id,
+            mentor_user=mentor_user,
+            mentee_user=mentee_user,
+            creation_date=datetime.now().timestamp(),
+            end_date=end_date_timestamp,
+            state=MentorshipRelationState.PENDING,
+            notes=notes,
+            tasks_list=tasks_list,
+        )
+
+        mentorship_relation.save_to_db()
+
+        return messages.MENTORSHIP_RELATION_WAS_SENT_SUCCESSFULLY, HTTPStatus.CREATED
diff --git a/app/api/models/mentorship_relation.py b/app/api/models/mentorship_relation.py
new file mode 100644
index 0000000..2c96f08
--- /dev/null
+++ b/app/api/models/mentorship_relation.py
@@ -0,0 +1,56 @@
+from flask_restx import fields, Model
+
+from app.utils.enum_utils import MentorshipRelationState
+
+
+def add_models_to_namespace(api_namespace):
+    api_namespace.models[
+        mentorship_request_response_body.name
+    ] = mentorship_request_response_body
+    api_namespace.models[relation_user_response_body.name] = relation_user_response_body
+
+relation_user_response_body = Model(
+    "User",
+    {
+        "id": fields.Integer(required=True, description="User ID"),
+        "name": fields.String(required=True, description="User name"),
+    },
+)
+
+mentorship_request_response_body = Model(
+    "List mentorship relation request model",
+    {
+        "id": fields.Integer(required=True, description="Mentorship relation ID"),
+        "action_user_id": fields.Integer(
+            required=True, description="Mentorship relation requester user ID"
+        ),
+        "sent_by_me": fields.Boolean(
+            required=True,
+            description="Mentorship relation sent by current user indication",
+        ),
+        "mentor": fields.Nested(relation_user_response_body),
+        "mentee": fields.Nested(relation_user_response_body),
+        "creation_date": fields.Float(
+            required=True,
+            description="Mentorship relation creation date in UNIX timestamp format",
+        ),
+        "accept_date": fields.Float(
+            required=True,
+            description="Mentorship relation acceptance date in UNIX timestamp format",
+        ),
+        "start_date": fields.Float(
+            required=True,
+            description="Mentorship relation start date in UNIX timestamp format",
+        ),
+        "end_date": fields.Float(
+            required=True,
+            description="Mentorship relation end date in UNIX timestamp format",
+        ),
+        "state": fields.Integer(
+            required=True,
+            enum=MentorshipRelationState.values,
+            description="Mentorship relation state",
+        ),
+        "notes": fields.String(required=True, description="Mentorship relation notes"),
+    },
+)
diff --git a/app/api/resources/mentorship_relation.py b/app/api/resources/mentorship_relation.py
new file mode 100644
index 0000000..a335fef
--- /dev/null
+++ b/app/api/resources/mentorship_relation.py
@@ -0,0 +1,78 @@
+import ast
+import json
+from flask import request
+from flask_restx import Resource, Namespace, marshal
+from flask_jwt_extended import jwt_required, get_jwt_identity
+from http import HTTPStatus
+from app import messages
+from app.api.request_api_utils import (
+    post_request, 
+    get_request,
+    put_request, 
+    http_response_checker, 
+    AUTH_COOKIE, 
+    validate_token)
+from app.api.resources.common import auth_header_parser
+from app.api.dao.mentorship_relation import MentorshipRelationDAO
+from app.api.dao.user_extension import UserExtensionDAO
+from app.api.models.mentorship_relation import *
+from app.utils.validation_utils import get_length_validation_error_message
+from app.database.models.bit_schema.mentorship_relation_extension import MentorshipRelationExtensionModel
+from app.utils.ms_constants import DEFAULT_PAGE, DEFAULT_USERS_PER_PAGE
+
+mentorship_relation_ns = Namespace(
+    "Mentorship Relation",
+    description="Operations related to " "mentorship relations " "between users",
+)
+add_models_to_namespace(mentorship_relation_ns)
+
+DAO = MentorshipRelationDAO()
+UserExtensionDAO = UserExtensionDAO()
+
+
+@mentorship_relation_ns.route("mentorship_relations")
+class GetAllMyMentorshipRelation(Resource):
+    @classmethod
+    @jwt_required
+    @mentorship_relation_ns.doc("get_all_user_mentorship_relations")
+    @mentorship_relation_ns.expect(auth_header_parser)
+    @mentorship_relation_ns.param(
+        name="relation_state",
+        description="Mentorship relation state filter.",
+        _in="query",
+    )
+    @mentorship_relation_ns.response(
+        HTTPStatus.OK,
+        "Return all user's mentorship relations, filtered by the relation state, was successfully.",
+        model=mentorship_request_response_body,
+    )
+    @mentorship_relation_ns.response(
+        HTTPStatus.UNAUTHORIZED,
+        f"{messages.TOKEN_HAS_EXPIRED}\n"
+        f"{messages.TOKEN_IS_INVALID}\n"
+        f"{messages.AUTHORISATION_TOKEN_IS_MISSING}"
+    )
+    @mentorship_relation_ns.marshal_list_with(mentorship_request_response_body)
+    def get(cls):
+        """
+        Lists all mentorship relations of current user.
+
+        Input:
+        1. Header: valid access token
+
+        Returns:
+        JSON array containing user's relations as objects.
+        """
+
+        user_id = get_jwt_identity()
+        rel_state_param = request.args
+        rel_state_filter = None
+
+        if rel_state_param:
+            rel_state_filter = rel_state_param["relation_state"].upper()
+
+        response = DAO.list_mentorship_relations(
+            user_id=user_id, state=rel_state_filter
+        )
+
+        return response