硫化铵，化学式为(NH₄)₂S。通常使用的是它的水溶液，固态不稳定，曝露在空气中会形成多硫化物和硫代硫酸盐。可用于摄影显色剂等。

硫化铵溶液，更准确地讲是硫氢化铵溶液，可由硫化氢通入氨水微热制得。浓氨水中通入硫化氢在常温下得到(NH₄)₂S·2NH₄HS，0 °C再通入硫化氢则得到(NH₄)₂S·12NH₄HS。用冰冷却，且不断通入硫化氢，会得到硫氢化铵溶液。

该溶液可溶解硫生成多硫化物铵盐： 2 (NH₄)SH + ½ S₈ ⇌ (NH₄)₂S₄ + H₂S

Ammonium sulfide, also known as diammonium sulfide, is an unstable salt with the formula (NH₄)₂S. Aqueous solutions purporting to contain this salt are commercially available. With a pK_a exceeding 15, the hydrosulfide ion cannot be deprotonated to an appreciable amount by ammonia. Thus, such solutions mainly consist of a mixture of ammonia and (NH₄)SH. Ammonium sulfide solutions are used occasionally in photographic developing, to apply patina to bronze, and in textile manufacturing. Also, due to its offensive smell, it is the active ingredient in a variety of foul pranks including the common stink bomb.