The maximum number of players on the field at any one time is 13, nine defensive players including the pitcher, and four offensive players, one occupying each base and the hitter. The catcher, by the way, is the only defensive player allowed to be in position not in fair territory.
If your questions refers to how many players are allowed in the "outfield" at any one time, the answer is there is no limit, all eight defensive players, including the catcher, if you so choose, may be positioned in the outfield. The only one not allowed is the pitcher, of course, who must pitch the ball to begin play.
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The question is too vague, and can also be considered a trick question. In a half inning, the defensive team starts with 9 players (8 in fair territory and (tricky) the catcher in the catcher's box in foul territory (not technically in the "field of play"). The offense has one batsman in the batters box and one batter waiting in the on-deck-circle, (both in foul territory). During the inning, players can be substituted in the field. Most often the pitcher can be relieved, but other fielders can also be replaced. Also, technically, the 1st and 3rd base coaches can be "players" on the roster, they are just not active while they are in their respective coaches boxes in foul territory.
In college, and Major League Baseball there are 9 players. Pitcher , Catcher, 1st base-man, 2nd base-man, shortstop, 3rd base-man, right field, center field, and left field. For young Baseball teams there are 10, Pitcher, Catcher, 1st base-man, 2nd base-man, 3rd base-man, right field, center right field, center left field, and left field.
There are nine players on defense. The first baseman, second basman, shortstop, thirdbaseman, pitcher, catcher, left fielder, right fielder, and center fielder. The number of those on offensive that are on the field varies on how many players get to the bases without getting out.
9 players per team. not counting the other team who may have someone on base or batting up.