2003 in sports describes the year's events in world sport.
| Centuries: | 20th century · 21st century · 22nd century |
| Decades: | 1970s 1980s 1990s 2000s 2010s 2020s 2030s |
| Years: | 2000 2001 2002 2003 2004 2005 2006 |
Men's professional
Men's amateur
Women's professional
Steeplechases
Flat races
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 | 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 | N/A | N/A | N/A | |
| March 27 | WEC 6: Return of a Legend | N/A | 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 | 6,700 | 35,000 | N/A | |
| June 6 | UFC 43: Meltdown | N/A | 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 | N/A | N/A | N/A | |
| August 10 | Pride Total Elimination 2003 | N/A | 40,316 | N/A | Quarterfinals to Pride GP 2003 middleweight tournament. | |
| September 26 | UFC 44: Undisputed | N/A | 10,400 | 94,000 | N/A | |
| October 5 | Pride Bushido 1 | N/A | N/A | N/A | N/A | |
| October 10 | Rumble on the Rock 4 | N/A | N/A | N/A | N/A | |
| November 9 | Pride Final Conflict 2003 | N/A | 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. |
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| November 21 | UFC 45: Revolution | N/A | 9,200 | 40,000 | N/A | |
| December 31 | Pride Shockwave 2003 | N/A | 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 | 43,560 | N/A | Event featured six K-1 MMA bouts and four K-1 kickboxing bouts. |
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