- UHAI EASHRI
- Uhuru Solidarity Movement
- UK WILPF
- Uladzimir Dzenisevich
- Umaro Djau
- Umarú Baldé
- Umaru Djau
- Umaru Jau
- Una Kumba Thompson
- Una Murray
- Unemployed People's Movement
- Unemployed People’s Movement
- Unga Revolution
- Unga Revoution Steering Committee
- United Nations General Assembly
- United Nations Press
- University of Dar es Salaam Academic Staff Assembly (UDASA)
- University of Pretoria
- Upenyu Makoni-Muchemwa
- Urgent Action Fund-Africa
- Uri Avnery
- Urooba Jamal
- Ursula Owusu, Ghana
- Ursula Troche
- Urusaro Alice Karekezi
- US Social Forum
- USA and Canada intellectuals and activists
- Usalama Reforms Forum
- Usu Mallya
- Uwazi-Twaweza