- YOUNGTIMER CLASSIC SPORT CARS CLUB, o.s.
- Yacht klub Mělník z.s.
- Y.C. Nové Sedlo
- Yachtmeni, z.s.
- YOUNG TALENTS, z. s.
- YACHT CLUB KLADNO z.s.
- Yobi Take Puraha Shakuhachi Collegium z.s.
- Yangame Gym
- YMCA Orlová
- Youth and World z. s.
- YIMBY Praha, z.s.
- YC RODOP, z.s.
- YounGuns Brno, z.s.
- Yacht Club Nautilus Praha
- YC CoolStar, z.s.
- Yes z.s.
- YACHT club Jablonec n.Nisou
- YERBABUENATEAM
- YACHT CLUB ORLÍK, z.s.
- Young Folks o.s.
- YWCA v České republice v likvidaci
- Young snipers team, z.s. "v likvidaci"
- Yacht club UNICORN, z. s.
- YESYES z.s.
- YMCA Třebechovice
- YACHT CLUB MARINA VLTAVA, z.s.
- Young Czech Arbitration Professionals, z.s.
- YMCA SKAUT
- Yacht Club Staré Město Praha, z.s.
- YMCA Plzeň, z. s.
- Ynnovations - Institut pro znalostní společnost v likvidaci
- YOUR FREESTYLE ACADEMY z.s.
- YettiOn, z.s.
- YAHÚ Team Kostelec, z.s.
- Yellow Hills z. s.
- Yacht Club NEPTUN Komárov z.s.
- Yacht club Rozkoš v likvidaci
- Yankee and Confederate Artillery Club Y.A.K.A.C.
- YMCA Jindřichův Hradec
- Yacht club ANCORA
- YMCA v České republice
- YPG Evropa, z.s. v likvidaci
- Young Brothers Gym z. s.
- YANDEROV, z. s.
- YC GRAF o.s. v likvidaci
- YARD RESORT, z.s.
- Youth For Future, z.s.
- Yacht Club ARCHER, z.s.
- YACHTCLUB PASOHLÁVKY z. s.
- YEAH, z.s.