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| English | Russian |
| All-Union Council of Evangelical Christians and Baptists | Всесоюзный совет христиан-баптистов (Voluntary association of Baptist churches in the former Soviet Union) |
| Hebrew Union College | Колледж иудейского союза (The oldest Jewish seminary in the United States for the training of rabbis, long a stronghold of American Reform Judaism) |
| International Union for Muslim Scholars | Международный союз мусульманских теологов (Alex_Odeychuk) |
| union church | церковь единения (A local church uniting members of diverse denominational backgrounds in an interdenominational congregation) |
| Union of American Hebrew Congregations | Союз американских иудейских конгрегации (Oldest American federation of Jewish congregations, which, since its founding in 1873, has sponsored many programs to strengthen Jewish congregations and promote Jewish education on every level) |
| Union of Brest | Берестейская уния (она же Брестская уния YuliaO) |
| Union of Brześć | Берестейская уния (она же Брестская уния YuliaO) |
| the Union of Orthodox Banner Bearers | Союз православных хоругвеносцев (denghu) |
| Union of Orthodox Jewish Congregations of America | Союз ортодоксальных иудейских конгрегаций Америки (Official federation of Jewish Orthodox synagogues in the United States and Canada; its counterpart organization for rabbis is the Rabbinical Council of America) |
| union of pentecostals | объединение пятидесятников |
| Union of Spiritual Communities of Christ | Союз Духовных Общин Христа (преемник Христианской Общины Вселенского Братства
 cyberleninka.ru dimock) |
| World Union for Progressive Judaism | Всемирный союз прогрессивного иудаизма (A worldwide body of Reform or Liberal Judaism) |