Necromancer is a 1982 computer game for the Atari 8-bit series created by Bill Williams and distributed by Synapse Software. A port to the Commodore 64 followed in 1983, and it was re-released by Atari in cartridge form for the Atari XEGS in 1987.

The player controls the wizard Illuminar who attempts to grow an army of trees to attack Tetragorn the Necromancer and his evil minions who are attempting to take over a graveyard. The game is an arcade action title, but is unusual in that there are three distinct segments of gameplay, each of which affects the one following it.