| Event: | Men's 49er |
| Games: | 2012 Summer |
| Dates: | 30 July – 8 August |
| Competitors: | 40 |
| Nations: | 20 |
| Goldnoc: | AUS |
| Silvernoc: | NZL |
| Bronzenoc: | DEN |
| Next: | 2016 |
The men's 49er was a sailing event on the Sailing at the 2012 Summer Olympics program in Weymouth and Portland National Sailing Academy. Sixteen races (last one a medal race) were scheduled and completed. 40 sailors, on 20 boats, from 20 nations competed. Ten boats qualified for the medal race on course area Nothe in front of Weymouth, where each position scored double points.
| bgcolor=LightBlue align=center | ● | Practice race | bgcolor=DodgerBlue align=center | ● | Race on Portland | bgcolor=Yellow align=center | ● | Race on Nothe | bgcolor=DarkGrey align=center | ● | Race on West | bgcolor=Gold align=center | ● | Medal race on Nothe |
See main article: Sailing courses at the 2012 Summer Olympics. For the 49er course areas Portland, Nothe, and West were used. The location (50° 35.19’ N, 02° 26.54’ W) points to the center Portland course area, the location (50° 36.18’ N 02° 25.98’ W) points to the center of the Nothe course area and the location (50° 37.18’ N 02° 23.55’ W) points to the center of the West course area. The target time for the course was 30 minutes for the races as well as the medal race. The race management could choose from many course configurations.