diff --git a/AUTHORS.md b/AUTHORS.md
index 1402897..38751a1 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -4,6 +4,7 @@ The list of contributors in alphabetical order:
 
 - [Audrius Mecionis](https://orcid.org/0000-0002-3759-1663)
 - [Camila Diaz](https://orcid.org/0000-0001-5543-797X)
+- [Daan Rosendal](https://orcid.org/0000-0002-3447-9000)
 - [Diego Rodriguez](https://orcid.org/0000-0003-0649-2002)
 - [Dinos Kousidis](https://orcid.org/0000-0002-4914-4289)
 - [Giuseppe Steduto](https://orcid.org/0009-0002-1258-8553)
diff --git a/reana_db/alembic/versions/20240314_1312_2e82f33ee37d_workflow_sharing.py b/reana_db/alembic/versions/20240314_1312_2e82f33ee37d_workflow_sharing.py
new file mode 100644
index 0000000..6a66347
--- /dev/null
+++ b/reana_db/alembic/versions/20240314_1312_2e82f33ee37d_workflow_sharing.py
@@ -0,0 +1,51 @@
+"""Workflow sharing.
+
+Revision ID: 2e82f33ee37d
+Revises: eb5309f3d8ee
+Create Date: 2024-03-14 13:12:01.029714
+
+"""
+
+import sqlalchemy_utils
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "2e82f33ee37d"
+down_revision = "eb5309f3d8ee"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    """Upgrade to 2e82f33ee37d revision."""
+    op.create_table(
+        "user_workflow",
+        sa.Column(
+            "workflow_id", sqlalchemy_utils.types.uuid.UUIDType(), nullable=False
+        ),
+        sa.Column("user_id", sqlalchemy_utils.types.uuid.UUIDType(), nullable=False),
+        sa.Column("access_type", sa.Enum("read", name="accesstype"), nullable=False),
+        sa.Column("message", sa.String(length=5000), nullable=True),
+        sa.Column("valid_until", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["__reana.user_.id_"],
+            name=op.f("fk_user_workflow_user_id_user_"),
+        ),
+        sa.ForeignKeyConstraint(
+            ["workflow_id"],
+            ["__reana.workflow.id_"],
+            name=op.f("fk_user_workflow_workflow_id_workflow"),
+        ),
+        sa.PrimaryKeyConstraint(
+            "workflow_id", "user_id", name=op.f("pk_user_workflow")
+        ),
+        schema="__reana",
+    )
+
+
+def downgrade():
+    """Downgrade to eb5309f3d8ee revision."""
+    op.drop_table("user_workflow", schema="__reana")
+    sa.Enum(name="accesstype").drop(op.get_bind())
diff --git a/reana_db/models.py b/reana_db/models.py
index 36609fc..61eb277 100644
--- a/reana_db/models.py
+++ b/reana_db/models.py
@@ -11,8 +11,8 @@
 from __future__ import absolute_import
 
 import enum
-import math
 import logging
+import math
 import uuid
 from datetime import datetime
 from functools import reduce
@@ -26,6 +26,21 @@
 )
 from reana_commons.errors import REANAValidationError
 from reana_commons.utils import get_disk_usage
+from reana_db.config import (
+    DB_SECRET_KEY,
+    DEFAULT_QUOTA_LIMITS,
+    DEFAULT_QUOTA_RESOURCES,
+    WORKFLOW_TERMINATION_QUOTA_UPDATE_POLICY,
+)
+from reana_db.utils import (
+    build_workspace_path,
+    store_workflow_disk_quota,
+    split_run_number,
+    update_users_cpu_quota,
+    update_users_disk_quota,
+    update_workflow_cpu_quota,
+    update_workspace_retention_rules,
+)
 from sqlalchemy import (
     BigInteger,
     Boolean,
@@ -43,6 +58,7 @@
     func,
     or_,
 )
+from sqlalchemy.dialects.postgresql import ARRAY
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.ext.hybrid import hybrid_property
 from sqlalchemy.orm import relationship
@@ -51,22 +67,6 @@
 from sqlalchemy_utils.types.encrypted.encrypted_type import AesEngine
 from sqlalchemy.dialects.postgresql import ARRAY
 
-from reana_db.config import (
-    DB_SECRET_KEY,
-    DEFAULT_QUOTA_LIMITS,
-    DEFAULT_QUOTA_RESOURCES,
-    WORKFLOW_TERMINATION_QUOTA_UPDATE_POLICY,
-)
-from reana_db.utils import (
-    build_workspace_path,
-    store_workflow_disk_quota,
-    split_run_number,
-    update_users_cpu_quota,
-    update_users_disk_quota,
-    update_workflow_cpu_quota,
-    update_workspace_retention_rules,
-)
-
 
 convention = {
     "ix": "ix_%(column_0_label)s",
@@ -159,6 +159,14 @@ class User(Base, Timestamp, QuotaBase):
     username = Column(String(length=255))
     tokens = relationship("UserToken", backref="user_", lazy="dynamic")
     workflows = relationship("Workflow", backref="owner", lazy="dynamic")
+    workflows_shared_with_me = relationship(
+        "Workflow",
+        secondary="__reana.user_workflow",
+        backref="users_it_is_shared_with",
+        lazy="dynamic",
+        viewonly=True,
+        sync_backref=False,
+    )
     audit_logs = relationship("AuditLog", backref="user_")
 
     def __init__(self, access_token=None, **kwargs):
@@ -1182,3 +1190,26 @@ class QuotaHealth(enum.Enum):
     healthy = 0
     warning = 1
     critical = 2
+
+
+class AccessType(enum.Enum):
+    """Enumeration of access types."""
+
+    read = 0
+
+
+class UserWorkflow(Base):
+    """UserWorkflow table."""
+
+    __tablename__ = "user_workflow"
+    __table_args__ = {"schema": "__reana"}
+
+    workflow_id = Column(UUIDType, ForeignKey("__reana.workflow.id_"), primary_key=True)
+    user_id = Column(UUIDType, ForeignKey("__reana.user_.id_"), primary_key=True)
+    access_type = Column(Enum(AccessType), default=AccessType.read, nullable=False)
+    message = Column(String(5000))
+    valid_until = Column(DateTime)
+
+    def __repr__(self):
+        """User Workflow string representation."""
+        return "<UserWorkflow {} {}>".format(self.workflow_id, self.user_id)