• U
• UC-XC
• Udmurtia ⚐
• UIOGD
• Ukraine
• Ukrainian Greek Catholic Church +
• Ukrainian Orthodox Church (Kyiv Patriarchate) +
• Ukrainian Trident
• Ulster ⚐
• Umbrella
• Unbeliever
• Undé
• Unification Church +
• Union Flag (Jack) ⚐
• Union Station
• Unitarian +
• Unitarian Universalism +
• United Anglican Church +
• United Church in Papua New Guinea +
• United Church of Canada +
• United Church of Christ +
• United Church of Christ in Japan
• United Church of Christ in Philippines +
• United Church of Zambia +
• United Congregational Church of Southern Africa +
• United Episcopal Church of North America
• United Evangelical Lutheran Church in India +
• United Kingdom ⚐
• United Methodist +
• United Pentecostal Church International +
• United States
• Uniting Church in Australia +
• Uniting Presbyterian Church in Southern Africa +
• Uniting Reformed Church in Southern Africa +
• Unity
• Universalism +
• Upheaval
• Upright
• Upside Down
• Upsilon
• Urdée (Urde, Urdy)
• US
• US Distinguished Flying
• US Navy
• Utrecht ⚐

⚐ denotes cross on the flag of a nation or region
+ denotes cross on the emblem of a church or denomination

There are countless more. We are continually updating information on all these crosses and adding more as they become known to us.