Ōba, Oba, Ooba or Ohba is a Japanese surname. Notable people with the surname include:
- Akira Oba , Japanese footballer
- Emiko Ohba , Japanese table tennis player
- Hideo Ohba , Japanese aikidoka and judoka
- Ōba Kagechika , Japanese samurai
- Kenji Oba , Japanese footballer
- Kenji Ohba , Japanese actor
- Mahito Ōba , Japanese voice actor and narrator
- Masao Ohba , Japanese boxer
- Mina Ōba , Japanese singer and actress
- Minako Oba , Japanese writer and social critic
- Miyabi Oba , Japanese figure skater
- Noriyoshi Ohba , Japanese video game designer
- Saichi Oba , Japanese submarine commander
- Sakae Ōba , Imperial Japanese Army officer
- Seiichi Oba , Japanese basketball player and executive
- Shōgyo Ōba , Japanese maki-e lacquer artist
- Shota Oba , Japanese baseball player
- Tsugumi Ohba , Japanese manga artist
