| Roster | ||||||||
| No | STARTERS | AGE | B | T | HT | WT | DOB | 2011 SALARY |
| 19 | Beckett, Josh | 31 | R | R | 6-5 | 225 | 05/15/1980 | $17,000,000 |
| Britton, Drake | 22 | 6-2 | 200 | 05/22/1989 | Not available | |||
| 11 | Buchholz, Clay | 27 | L | R | 6-3 | 190 | 08/14/1984 | $555,000 |
| 56 | Duckworth, Brandon | 36 | R | R | 6-1 | 215 | 01/23/1976 | Not available |
| 35 | Haeger, Charlie | 28 | R | R | 6-1 | 210 | 09/19/1983 | Not available |
| 41 | Lackey, John | 33 | R | R | 6-6 | 245 | 10/23/1978 | $15,950,000 |
| 31 | Lester, Jon | 28 | L | L | 6-4 | 240 | 01/07/1984 | $5,750,000 |
| 45 | Mathis, Doug | 28 | R | R | 6-3 | 220 | 06/07/1983 | Not available |
| 18 | Matsuzaka, Daisuke | 31 | R | R | 6-0 | 185 | 09/13/1980 | $10,333,333 |
| 30 | Miller, Andrew | 26 | L | L | 6-7 | 207 | 05/21/1985 | $1,300,000 |
| 62 | Mortensen, Clayton | 26 | R | R | 6-4 | 185 | 04/10/1985 | $414,000 |
| 74 | Pimentel, Stolmy | 22 | R | R | 6-3 | 165 | 02/01/1990 | Not available |
| 52 | Silva, Carlos | 32 | R | R | 6-4 | 280 | 04/23/1979 | Not available |
| 62 | Spoone, Chorye | 26 | R | R | 6-1 | 215 | 09/16/1985 | Not available |
| No | BULLPEN | AGE | B | T | HT | WT | DOB | 2011 SALARY |
| 91 | Aceves, Alfredo | 29 | R | R | 6-3 | 220 | 12/08/1982 | $650,000 |
| 32 | Albers, Matt | 29 | L | R | 6-0 | 225 | 01/20/1983 | $875,000 |
| 48 | Atchison, Scott | 35 | R | R | 6-2 | 200 | 03/29/1976 | $454,000 |
| 40 | Bailey, Andrew | 27 | R | R | 6-3 | 240 | 05/31/1984 | $465,000 |
| 51 | Bard, Daniel | 26 | R | R | 6-4 | 215 | 06/25/1985 | $505,000 |
| 64 | Bowden, Michael | 25 | R | R | 6-3 | 215 | 09/09/1986 | $417,500 |
| 43 | Carlson, Jesse | 31 | L | L | 6-1 | 160 | 12/31/1980 | $450,000 |
| 61 | Doubront, Felix | 24 | L | L | 6-2 | 165 | 10/23/1987 | $417,000 |
| 53 | Hill, Rich | 31 | L | L | 6-4 | 185 | 03/11/1980 | $414,000 |
| 75 | Inman, Will | 25 | R | R | 6-0 | 213 | 02/06/1987 | Not available |
| 52 | Jenks, Bobby | 30 | R | R | 6-4 | 275 | 03/14/1981 | $6,000,000 |
| 54 | Melancon, Mark | 26 | R | R | 6-2 | 215 | 03/28/1985 | $421,000 |
| 46 | Morales, Franklin | 26 | L | L | 6-0 | 210 | 01/24/1986 | $424,000 |
| 46 | Pena, Tony | 30 | R | R | 6-2 | 180 | 03/23/1981 | Not available |
| 63 | Tazawa, Junichi | 25 | R | R | 5-11 | 180 | 06/06/1986 | $1,500,000 |
| 65 | Thomas, Justin | 28 | L | L | 6-3 | 218 | 01/18/1984 | Not available |
| No | CATCHERS | AGE | B | T | HT | WT | DOB | 2011 SALARY |
| 59 | Exposito, Luis | 25 | R | R | 6-3 | 210 | 01/20/1987 | $414,000 |
| 60 | Lavarnway, Ryan | 24 | 6-4 | 225 | 08/07/1987 | $414,000 | ||
| 39 | Saltalamacchia, Jarrod | 26 | S | R | 6-4 | 235 | 05/02/1985 | $750,000 |
| 10 | Shoppach, Kelly | 31 | R | R | 6-0 | 220 | 04/29/1980 | $3,000,000 |
| No | INFIELDERS | AGE | B | T | HT | WT | DOB | 2011 SALARY |
| 62 | Anderson, Lars | 24 | L | L | 6-4 | 215 | 09/25/1987 | $414,000 |
| 3 | Aviles, Mike | 30 | R | R | 5-10 | 205 | 03/13/1981 | $640,000 |
| 3 | Ciriaco, Pedro | 26 | R | R | 6-0 | 170 | 09/27/1985 | $414,000 |
| 28 | Gonzalez, Adrian | 29 | L | L | 6-2 | 225 | 05/08/1982 | $6,300,000 |
| 76 | Iglesias, Jose | 22 | R | R | 5-11 | 175 | 01/05/1990 | $2,062,500 |
| Middlebrooks, Will | 23 | 6-4 | 200 | 09/09/1988 | Not available | |||
| 15 | Pedroia, Dustin | 28 | R | R | 5-8 | 180 | 08/17/1983 | $5,750,000 |
| 8 | Punto, Nick | 34 | S | R | 5-9 | 190 | 11/08/1977 | $750,000 |
| 71 | Spears, Nate | 26 | L | R | 5-11 | 174 | 05/03/1985 | $414,000 |
| 84 | Tejeda, Oscar | 22 | R | R | 6-1 | 170 | 12/26/1989 | Not available |
| 20 | Youkilis, Kevin | 32 | R | R | 6-1 | 220 | 03/15/1979 | $12,250,000 |
| No | OUTFIELDERS | AGE | B | T | HT | WT | DOB | 2011 SALARY |
| 13 | Crawford, Carl | 30 | L | L | 6-2 | 215 | 08/05/1981 | $14,857,142 |
| 2 | Ellsbury, Jacoby | 28 | L | L | 6-1 | 185 | 09/11/1983 | $2,400,000 |
| 55 | Gathright, Joey | 30 | L | R | 5-10 | 185 | 04/27/1981 | $414,000 |
| 55 | Kalish, Ryan | 23 | L | L | 6-1 | 215 | 03/28/1988 | $417,000 |
| 85 | Lin, Che-Hsuan | 23 | R | R | 6-0 | 180 | 09/21/1988 | Not available |
| 54 | McDonald, Darnell | 33 | R | R | 5-11 | 205 | 11/17/1978 | $470,000 |
| 13 | Ross, Cody | 31 | R | L | 5-10 | 195 | 12/23/1980 | $6,300,000 |
| 15 | Sweeney, Ryan | 26 | L | L | 6-4 | 225 | 02/20/1985 | $1,400,000 |
| No | DESIGNATED HITTERS | AGE | B | T | HT | WT | DOB | 2011 SALARY |
| 34 | Ortiz, David | 36 | L | L | 6-4 | 230 | 11/18/1975 | $12,500,000 |