The 2005 Mr. Olympia contest was an IFBB professional bodybuilding competition and the feature event of Joe Weider's 2005 Olympia Weekend held October 15–16, 2005 at the Orleans Arena in Las Vegas, Nevada.
The total prize amount given during the exhibition was $711,000, an increase of 32% from 2004. The total prize money for the men's Mr. Olympia was $550,000.
| Place | Prize | Name | Country | 1 | 2 | 3 | 4 | Points | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | $150,000 | Ronnie Coleman |  | 7 | 5 | 5 | 5 | 22[1] | |
| 2 | $85,000 | Jay Cutler | | 8 | 10 | 10 | 10 | 38 | |
| 3 | $55,000 | Gustavo Badell | 21 | 19 | 16 | 15 | 71 | ||
| 4 | $45,000 | Günter Schlierkamp |  | 20 | 16 | 19 | 20 | 75 | |
| 5 | $35,000 | Víctor Martínez |  | 22 | 25 | 26 | 25 | 98 | |
| 6 | $27,000 | Dennis James | | 31 | 32 | 37 | 100 | ||
| 7 | $16,000 | Melvin Anthony | | 31 | 40 | 31 | 102 | ||
| 8 | $15,000 | Branch Warren | | 46 | 35 | 40 | 121 | ||
| 9 | $14,000 | Darrem Charles | 40 | 50 | 46 | 136 | |||
| 10 | $12,000 | Mustafa Mohammad |  | 57 | 50 | 48 | 155 | ||
| 11 | $2,000 | Johnnie O. Jackson | | 59 | 51 | 52 | 162 | ||
| 12 | $2,000 | George Farah | 60 | 61 | 61 | 182 | |||
| 13 | $2,000 | Chris Cormier | | 51 | 73 | 67 | 191 | ||
| 14 | $2,000 | David Henry | | 71 | 64 | 66 | 201 | ||
| 15 | $2,000 | Markus Rühl | | 69 | 75 | 68 | 212 | ||
| 16 | $2,000 | Kris Dim | | 77 | 78 | 155 | |||
| 16 | $2,000 | Craig Richardson | | 79 | 80 | 159 | |||
| 16 | $2,000 | Ronny Rockel | | 80 | 79 | 159 | |||
| 16 | $2,000 | Quincy Taylor | | 80 | 80 | 160 | |||
| 16 | $2,000 | Aleksandr Fyodorov | 80 | 80 | 160 | ||||
| 16 | $2,000 | Mike Sheridan | 80 | 80 | 160 |