吡咯烷，又称四氢吡咯，是五元含氮的饱和杂环化合物。

吡咯烷是无色透明有特殊氨气味的液体，见光或潮湿空气易变黄色，有毒。与水、乙醇、乙醚、氯仿混溶。四氢吡咯的衍生物广泛存在于许多天然产物中，如烟草中的成分尼古丁和蛋白质中的脯氨酸就是四氢吡咯的2-取代物。

Pyrrolidine, also known as tetrahydropyrrole, is an organic compound with the molecular formula (CH₂)₄NH. It is a cyclic secondary amine, also classified as a saturated heterocycle. It is a colourless liquid that is miscible with water and most organic solvents. It has a characteristic semen-like odor. Compared to acyclic secondary amines, it is about 10 times more basic.