Seiko Hashimoto (Japanese: 橋本 聖子, Hepburn: Hashimoto Seiko, born 5 October 1964) is a Japanese politician, former speed skater and track cyclist. She has the most Olympic appearances of any Japanese athlete except Noriaki Kasai, representing her native country in four consecutive Winter Olympics from 1984 to 1994 and in three consecutive Summer Olympics from 1988 to 1996. She is currently a member of the House of Councillors from the Liberal Democratic Party, and serves as the President of the Japan Skating Federation. She is affiliated to the revisionist lobby Nippon Kaigi.