Cause Directory: O
- Oyne School PTA - Insch
- Oyster Indoor Bowls Club
- Oyster Park Primary Academy - Castleford
- Oyster Project Charity
- Oysterfields Explorer Scouts
- Oystermouth Primary School PTA
- Oysterworldwide South Africa 2016 - Hope Wall
- Oz Moot Fund - Emily Armitage
- OzCampsIntTan
- Ozer Umagen / Gezint
- Ozge's Post Grade Saving
- Oziegbe Imhontu Uni Fund
- Ozlem Uni Funds
- Ozo's University Fund
- Ozzy Sayers - World Challenge
- Ozzy the Rottweiler 2023 - Koadie Hutchinson
- O’Halloran Hill Pelicans FC
- oge saving
- oncomove
- one nation welfare trust uk
- one woman Read-a-thon for MIND
- operation wallacea Madagascar 2017 - Megan Oldridge
- originalprojects
- outlook expeditions - Borneo 2025 - Lewis Rich
- outlook expeditions-Tanzania 2025-Charlie Bourne