利多卡因（英语：Lidocaine）是局部麻醉及抗心律失常药，它是可卡因的一种衍生物，但没有可卡因产生幻觉和上瘾的成分。

利多卡因其盐酸盐为白色结晶性粉末，易溶于水，毒力和普鲁卡因相当，但局部麻醉效果较强而持久，有良好的表面穿透力，可注射也可作表面麻醉。

利多卡因是非常好的局部麻醉剂，一般施用一到三分钟后即生效，效果维持一到三小时。用于治疗口腔溃疡。作为心律紊乱药它现在已经不很常被使用了，原因是有人担心它会有长期副作用。少数人对利多卡因有过敏。

Lidocaine, also known as xylocaine and lignocaine, is a medication used to numb tissue in a specific area and to treat ventricular tachycardia. It can also be used for nerve blocks. Lidocaine mixed with a small amount of epinephrine is available to allow larger doses to be used as numbing and to make it last longer. When used as an injectable it typically begins working within four minutes and lasts for half an hour to three hours. Lidocaine may also be applied directly to the skin for numbing.