22- 11 on each team. 10 field players and 1 goalie.
I'm pretty sure there can be as many substitutions as you want in the game.
A team can have up to 16 players generally. 11 players are on the field at one time - 10 field players and 1 goal keeper. Up to 5 players can be on the 'bench' and can be rotated into the game at any time.
As many can dress as you like, but only 16 can play.
there are 11 for each team including a goalie
Field hockey is a whole year sport in most countries; the offseason is usually the summer, when many players play the easier form of summer hockey (rule alterations include not being allowed to raise or hit the ball, playing on a halfsize field, less players, etc.).
An Olympic field hockey team has a roster of sixteen players.
26 players on a field
In the National Hockey League, 20 players are allowed to dress for a game and 23 are allowed on the 'active roster'.
11 in outdoor 5 in indoor