Each year on September 21, the World Council of Churches calls churches and parishes to observe the International Day of Prayer for Peace. September 21 is also the United Nations-sponsored International Day of Peace.

As it approaches, the World Council of Churches invites people to offer prayers for peace.

Observances of the peace prayer day began in 2004 as part of the ecumenical Decade to Overcome Violence (2001-2010) after an agreement between the heads of the WCC and the UN.