The Catholic churches in Windsor are members of Churches Together in Windsor (CTW), which aims to encourage local churches to work, worship and pray together.

The Core Group prays together and plans joint activities between the member Churches, including the World Day of Prayer service (on the first Friday in March); Good Friday Witness (a walk between the churches ending in the town centre); Week of Prayer for Christian Unity (services in each church open to others); a joint service at Pentecost; the Annual Assembly in November; and Carols on the Hill (a service of lessons and carols at the statue of Queen Victoria, supported by the Band of the Household Cavalry).

CTW also links the churches by newsletters and publicity of events taking place at various churches but not specifically run by CTW (e.g., Christian Aid events, concerts, quiz nights, harvest supper, messy church, talks, walks, etc).