25
Major League baseball teams are allowed a roster of 40 players with 25 allowed to be active during the regular season until September when the active roster can be expanded up to the 40 player limit. Only nine players may be in the lineup and any one time during a game.
53 on active roster
usually 25-26 but there are more players on a roster during the end of the season and during the playoffs.
NFL teams are allowed to have 53 players on their roster.
As of the 2008 season, all teams in the NFL are allowed to have 53 players on their roster.
In MLB you may use your entire roster in a single game, however, once a player is removed from the game he may not return.
In the National League Championship Series, each team is allowed twenty-five members on the roster. This is no different from any other game during the regular season (before September 1), or any game in the post season.
There is no limit as to how many quarterbacks can be on a team. Generally, a team keeps three QBs on the 53 man roster.
The Detroit Lions have an extensive history in the NFL. They have had many players on their roster through the years. However, they have never had a player named Dean Leatherman.
During the season they are allowed to have 53 players on their roster. Players that are on the Practice squad or designated as Injured Reserve do not count against this limit.
The Super Bowl roster is 53 men strong for each team.