Can You Play GTA IV with Two Controllers on One Console?

No split-screen co-op in the main campaign. GTA IV is strictly single-player. A second controller can only:

• Control the in-game phone/camera in passenger seat (very limited).
• Navigate menus if player 1 hands off.

Multiplayer Options

• Split-Screen: Only in Deathmatch and Team Deathmatch modes (offline, 2 players). Reduced frame rate & visual quality.
• Online: Free Mode, Races, Cops 'n Crooks, etc.—up to 16 players (Xbox 360/PS3) or 32 (PC). Requires separate consoles/accounts.
• Episodes from Liberty City (DLC): Same multiplayer modes; no campaign co-op.

Better Local Co-op Alternatives

GTA V (no split-screen), Saints Row 2/3/4 (online co-op only), Just Cause 2/3/4 (mods for co-op), LEGO Marvel Super Heroes, Borderlands series (split-screen).