John-Olav Einemo (born 10 December 1975) is a Norwegian retired mixed martial artist.

He is also a Brazilian Jiu-Jitsu practitioner, with the highlight of his career being the win in the ADCC Submission Wrestling World Championship in 2003 (88–98 kg weight class).

He is the only man to defeat multiple-time BJJ champion Roger Gracie in the ADCC Submission Wrestling World Championship tournament.

He fought for a number of promotions in Finland and the Netherlands, quickly amassing an undefeated record of 4–0.

Einemo did not compete from 2003 to 2006 due to complications of contracting a flesh-eating bacterial infection on his left foot following surgery.