The outfield is a sporting term used in cricket and baseball to refer to the area of the field of play further from the batsman or batter than the infield, and in association football to players outside the goal.
In cricket and baseball 
In both baseball and cricket, fielders in the outfield have more ground to cover, but also more time before the ball reaches them. Catches are most likely to arise from shots that have been 'skied' (in cricket) or 'popped up' (in baseball). If a catch is not possible (for example, the ball has bounced, or is rolling or skidding across the turf) the fielder will attempt to head off, pick up and throw in the ball as quickly as possible to reduce the distance the runners can run and hopefully to effect a run out (cricket) or tag out (baseball).
In cricket, where the ball is far more likely to stay low against the ground than in baseball, the condition of the turf has a major effect on the speed at which the ball travels through the outfield. On a slow outfield the ball decelerates significantly, making fielding easier and batting harder — in particular boundaries are far harder to hit. This usually occurs if the playing surface is uneven or if it is damp from rain or dew. However, on a fast outfield the ball does not decelerate significantly even when rolling along the turf, often racing past the fielders and over the boundary rope. In these circumstances, batsmen find it easier to score runs quickly. Commentators often refer to the ball accelerating to the boundary on fast outfields, but this only physically occurs on grounds with a slope and on which the ball is moving downhill.
In baseball, a slow, damp outfield is usually considered an advantage for the hitter, in as much as a batted ball will not travel as quickly to an outfielder in the traditional deep position for fly balls, and thus may permit additional advance by batters and other runners on the basepaths. In addition, a wet, slick ball can not be thrown with the accuracy of a dry one, also permitting the opportunity for additional advance on the bases. Moreover, a wet field generally slows the footspeed of the defense, so fielders will be able to reach fewer flies and line drives in the air before they go through to the fences.
Association football 
In association football, eleven players are fielded in each match. The goalkeeper remains in the goal, and the remaining ten players are "outfield" players.
See also 
- Fielding (cricket)
- Baseball field
- Total Football
- Outfielder for more information about the baseball fielding positions in the outfield.