Seikichi (written: 清吉 or 政吉) is a masculine Japanese given name. Notable people with the name include:
Seikichi Odo (1926–2002), Japanese karateka (1917–1998), Japanese karateka
Fictional characters: character in the stage play and anime series Oh! Edo Rocket Seikichi Tamaya is an antagonist in Hidamari no Ki