氮芥类物质（英语：Nitrogen mustards）是一类结构与芥子气相似的细胞毒化疗药物，属于非选择性烷化剂的一种。

虽然主要应用于临床，早期的氮芥类物质也能像芥子气一样用作化学武器。在第二次世界大战许多国家都有着氮芥的库存，但后来并未投入使用。他们与芥子**属于毒性强烈且持久的糜烂性毒剂。因此，这些物质的生产和使用受到了严格的限制。氮芥类现已属于被淘汰的毒剂。

氮芥类中毒性最强的为HN3（三氯三乙胺）。其盐酸盐为白色无嗅晶体，稳定性高于HN3本身，因此军方贮存或实验室制备的多为盐酸盐，使用时用NaOH处理并蒸馏即可得到纯净的HN3；此外因其极难水解，亦可用于食物与水源的染毒。

The nitrogen mustards are cytotoxic chemotherapy agents similar to mustard gas. Although their common use is medicinal, in principle these compounds can also be deployed as chemical warfare agents. Nitrogen mustards are nonspecific DNA alkylating agents. Nitrogen mustard gas was stockpiled by several nations during the Second World War, but it was never used in combat. As with all types of mustard gas, nitrogen mustards are powerful and persistent blister agents and the main examples (HN1, HN2, HN3, see below) are therefore classified as Schedule 1 substances within the Chemical Weapons Convention. Production and use is therefore strongly restricted.