| Birth Place: | San Francisco, California, United States |
| Nationality: | American |
| Weight: | 170lb[1] |
| Weight Class: | Welterweight |
| Fighting Out Of: | San Francisco, California, United States |
| Rank: | Black belt in Brazilian jiu-jitsu [2] |
| Years Active: | 2006–2010 |
| Mma Kowin: | 3 |
| Mma Subwin: | 3 |
| Mma Koloss: | 1 |
| Mma Decloss: | 2 |
| Sherdog: | 16504 |
Luke Stewart is a retired American mixed martial artist. Holding a professional record of 6–3, Stewart competed in the now-defunct promotion Strikeforce for his entire career.
Luke Stewart has trained and competed in Brazilian jiu-jitsu for several years, and is a black belt under Ralph Gracie, in San Francisco, California.
Stewart made his professional mixed martial arts debut in 2006, signing with now-defunct promotion Strikeforce in May 2006. He made his debut facing Bill Duvall at on June 9, 2006. He won the fight via armbar submission, 1:15 into the first round.[3]
In his second fight with the promotion, Stewart faced Jeremiah Metcalf at on October 7, 2006. He won the fight via rear-naked choke.[4] He then faced UFC veteran Jason Von Flue at on June 22, 2007. He won the fight via third round TKO.[5]
Stewart faced Sam Liera at on September 29, 2007.[6] He won the fight via first round TKO.[7] In his fifth fight with the promotion, Stewart faced Bryson Kamaka at on November 16, 2007.[8] He won the fight via knockout, just 19 seconds into the first round.[9]
In his next fight, he faced Tiki Ghosn at on March 29, 2008.[10] Despite being a considerable betting favorite coming into the bout, Stewart lost the fight via unanimous decision, the first loss of his professional MMA career.
Stewart faced Jesse Juarez at on September 20, 2008.[11] He won the fight via first round armbar. Joe Riggs at on November 21, 2008.[12] He lost the fight via second round TKO.
After a one-year hiatus from MMA, Stewart returned to face André Galvão at on March 26, 2010.[13] He lost the fight via split decision, and subsequently retired from mixed martial arts shortly after.
Stewart is the owner of his own Tattoo shop, Seventh Son Tattoo, in San Francisco, California.[14]
|-| Loss| align=center| 6–3| André Galvão| Decision (split)| Strikeforce Challengers: Johnson vs. Mahe| | align=center| 3| align=center| 5:00| San Jose, California, United States| |-| Loss| align=center| 6–2| Joe Riggs| TKO (punches)| | | align=center| 2| align=center| 2:05| San Jose, California, United States| |-| Win| align=center| 6–1| Jesse Juarez| Submission (armbar)| | | align=center| 1| align=center| 4:55| Beverly Hills, California, United States| |-| Loss| align=center| 5–1| Tiki Ghosn| Decision (unanimous)| | | align=center| 3| align=center| 5:00| San Jose, California, United States| |-| Win| align=center| 5–0| Bryson Kamaka| KO (knee)| | | align=center| 1| align=center| 0:19| San Jose, California, United States| |-| Win| align=center| 4–0| Sam Liera| TKO (punches)| | | align=center| 1| align=center| 3:40| Beverly Hills, California, United States| |-| Win| align=center| 3–0| Jason Von Flue| TKO (punches)| | | align=center| 3| align=center| 2:17| San Jose, California, United States| |-| Win| align=center| 2–0| Jeremiah Metcalf| Submission (rear-naked choke)| | | align=center| 1| align=center| 2:19| Fresno, California, United States| |-| Win| align=center| 1–0| Bill Duvall| Submission (armbar)| | | align=center| 1| align=center| 1:15| San Jose, California, United States|