International Volunteer Day (IVD) is celebrated annually on 5 December. The Day provides an opportunity for volunteers and organisations to celebrate their efforts, share their values, and promote their work among communities, non-governmental organisations (NGOs), UN agencies, government authorities, and the private sector.

The UN Volunteers (UNV) programme organises events to mark the Day annually. UNV mobilises thousands of volunteers every year, advocates for the recognition of volunteers, and works with partners to integrate volunteerism into development programming.

International Volunteer Day was designated by the UN General Assembly in 1985 (A/RES/40/212).