Lucia Rijker (born December 7, 1967) is a Dutch professional female boxer and Kung Fu fighter who has reportedly only lost one fight in both her professions combined, namely, during a Kung Fu competition.

Rijker, as a Kung Fu fighter, has been on the cover of Inside Kung Fu magazine. As a professional boxer, she has been able to win the WIBF world Welterweight title, and she has beaten name fighters such as Marcela Acuna, knocked out in five rounds. Many of women's boxing's fans have been claiming for a meeting between her and Christy Martin for years. However, negotiations have not led to such a fight happening. In 2000, she and Martin met at a press conference to announce a Martin fight, and they brawled during the conference.

After winning her first 14 fights, but failing to secure a match with Martin, Rijker stepped away from the sport in 1999 to pursue a career in Hollywood. However, she returned to the ring in February of 2002, and then defeated standout Jane Couch on June 21, 2003 for her 16th win without a loss.

Recently, she starred as a boxer in the 2004 film Million Dollar Baby.