胱胺（英语：Cystamine），是一种有机二硫化物。由胱氨酸受热脱羧反应后形成。胱胺是一种不稳定的液体，一般使用其二盐酸盐 C₄H₁₂N₂S₂·2HCl，后者至203～214°C稳定，高于此温度则分解。食用胱胺有毒，吸入也有潜在危害。

Cystamine is an organic disulfide. It is formed when cystine is heated, the result of decarboxylation. Cystamine is an unstable liquid and is generally handled as the dihydrochloride salt, C₄H₁₂N₂S₂·2HCl, which is stable to 203-214 °C at which point it decomposes. Cystamine is toxic if swallowed or inhaled and potentially harmful by contact.