Sawai (written: 沢井 lit. "swamp well") is a Japanese surname. Notable people with the surname include:
Anna Sawai (born 1992), Japanese actress Eagle Sawai (born 1967), Japanese professional wrestler Gloria Sawai (1932–2011), American-Canadian author Hikaru Sawai (born 1964), Japanese koto player and composer, son of Kazue and Tadao Sawai Kazue Sawai (1941–2026), Japanese koto player and composer Kenichi Sawai (1903–1988), Japanese martial artist and army officer Koji Sawai (born 1955), Japanese anime director and artist Miku Sawai (born 1993), Japanese musician Miyuu Sawai (born 1987), Japanese actress Ryosuke Sawai (born 1978), Japanese baseball player Sawai Atsuhiro (born 1939), Japanese yoga practitioner Shinichiro Sawai (1938–2021), Japanese filmmaker Tadao Sawai (1938–1997), Japanese koto player and composer Yoshio Sawai (born 1977), Japanese manga artist