2003 in sports describes the year's events in world sport.
|Years in sports:||2000 2001 2002 2003 2004 2005 2006|
|Centuries:||20th century · 21st century · 22nd century|
|Decades:||1970s 1980s 1990s 2000s 2010s 2020s 2030s|
|Years:||2000 2001 2002 2003 2004 2005 2006|
The following is a list of major noteworthy MMA events during 2003 in chronological order.
|Date||Event||Alternate Name/s||Location||Attendance||PPV Buyrate||Notes|
|February 28||UFC 41: Onslaught||N/A||Atlantic City, New Jersey, US||13,401||60,000||This event marked the return of Tank Abbott to the UFC. This was Abbott's first fight since October 1998.|
|March 16||Pride 25: Body Blow||N/A||Yokohama, Japan||N/A||N/A||N/A|
|March 27||WEC 6: Return of a Legend||N/A||Lemoore, California, US||N/A||N/A||This event is noted for the return of Frank Shamrock in his first fight since retiring. Shamrock had not fought since December 2000.|
|April 25||UFC 42: Sudden Impact||N/A||Miami, Florida, US||6,700||35,000||N/A|
|June 6||UFC 43: Meltdown||N/A||Paradise, Nevada, US||9,800||49,000||UFC rule change, in the event of a stoppage fights restart in the position the fight was stopped.|
|June 8||Pride 26: Bad to the Bone||Pride 26: Reborn||Yokohama, Japan||N/A||N/A||N/A|
|August 10||Pride Total Elimination 2003||N/A||Saitama, Japan||40,316||N/A||Quarterfinals to Pride GP 2003 middleweight tournament.|
|September 26||UFC 44: Undisputed||N/A||Las Vegas, Nevada, US||10,400||94,000||N/A|
|October 5||Pride Bushido 1||N/A||Saitama, Japan||N/A||N/A||N/A|
|October 10||Rumble on the Rock 4||N/A||Honolulu, Hawaii, US||N/A||N/A||N/A|
|November 9||Pride Final Conflict 2003||N/A||Tokyo, Japan||67,450||N/A||Present record holder for the highest attendance of a strictly MMA event. |
Semifinals and final to Pride GP 2003 middleweight tournament.
Wanderlei Silva becomes the Pride 2003 middleweight Grand Prix champion.
|November 21||UFC 45: Revolution||N/A||Uncasville, Connecticut, US||9,200||40,000||N/A|
|December 31||Pride Shockwave 2003||N/A||Saitama, Japan||39,716||N/A||Gary Goodridge announced he would retire from Pride FC at this event.|
|December 31||K-1 PREMIUM 2003 Dynamite!!||N/A||Nagoya, Japan||43,560||N/A||Event featured six K-1 MMA bouts and four K-1 kickboxing bouts.|