Week of Prayer for Christian Unity

The Week of Prayer for Christian Unity has a history of over 100 years . . . , in which Christians around the world have taken part in an octave of prayer for visible Christian unity.  By annually observing the WPCU, Christians move toward the fulfillment of Jesus' prayer at the Last Supper "that they all may be one."  (cf. John 17:21)

Excerpt from the USCCB Website