Seigo (written: , or ) is a masculine Japanese given name. Notable people with the name include:

, Japanese darts player , Japanese politician , Japanese dermatologist Seigo Nakao, head of Japanese Studies at Oakland University , Japanese footballer

Seigō or Seigou (written: , , or ) is a separate masculine given name, though it may be romanized the same way. Notable people with the name include:

, Japanese footballer , Japanese politician , Japanese footballer , Japanese judoka , founder of Goju-Ryu Seigokan Karatedo , Japanese drift driver

See also Seigo Kosaku