Of course, not all of these are used on the various Ladders (1v1, 2v2, 3v3, 4v4, and FFA). Blizzard will add and remove maps to the ladder throughout the life of the game, but they currently utilize the following map selection pools (note: the number of players refers to the number of possible starting positions).

1 versus 1
• Blistering Sands - 2 players
• Desert Oasis - 2 players
• Scrap Station - 2 players
• Steppes of War - 2 players
• Xel'Naga Caverns - 2 players
• Kulas Ravine - 4 players
• Lost Temple - 4 players
• Metalopolis - 4 players
• Delta Quadrant - 4 players

2 versus 2
• Arid Wastes - 4 players
• Discord IV - 4 players
• Monlyth Ridge - 4 players
• Scorched Haven - 4 players
• Twilight Fortress - 4 players
• Tarsonis Assault - 4 players
• Tempest - 8 players
• High Orbit - 4 players
• War Zone - 4 players

3 versus 3
• Arakan Citadel - 6 players
• Colony 426 - 6 players
• Dig Site - 6 players
• Frontier - 6 players
• Monsoon - 6 players
• Quicksand - 6 players
• The Bio Lab - 6 players
• Ulaan Deeps - 6 players
• Typhon - 6 players

4 versus 4
• Extinction - 8 players
• High Ground - 8 players
• Lava Flow - 8 players
• Megaton - 8 players
• Outpost - 8 players
• Sand Canyon - 8 players
• Toxic Slums - 8 players

Free-For-All
• Kulas Ravine - 4 players
• Lost Temple - 4 players
• Metalopolis - 4 players
• Tectonic Rift - 6 players
• Quicksand - 6 players
• Abyss - 8 players