N-甲基色胺（英语：N-Methyltryptamine，NMT）是一种色胺衍生物。它作为一种生物碱，很可能在机体内由L-色氨酸合成，常见于几种植物的树皮、嫩芽和叶，包括维罗拉、金合欢、含羞草和合欢草，并与N,N-二甲基色胺（DMT）和 5-甲氧基-N,N-二甲基色胺（5-MeO-DMT）等化合物相关。在人体中，它也作为L-色氨酸的最终代谢产物合成。它也是人尿液中的痕量成分。

NMT和色胺与二甲基色胺（DMT）类似，也能作为TAAR1的激动剂。

N-Methyltryptamine (NMT), or methyltryptamine, is a member of the tryptamine chemical class. It is an alkaloid, probably derived from L-tryptophan, that has been found in the bark, shoots and leaves of several plant species, including Virola, Acacia, Mimosa and Desmanthus often together with the related compounds N,N-dimethyltryptamine (DMT) and 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT). It is also synthesized in the human body as a metabolic endproduct of the amino acid L-tryptophan. It was found to be a natural trace component in human urine.