梁楷，生卒年不详，中国南宋画家，祖籍东平（今属山东），居钱塘（今浙江杭州）。工人物、佛道、鬼神，兼山水、花鸟。

梁楷性情豪放，不拘礼法，曾自号“梁疯子”，曾经被任命画院待诏，但将金带挂于院中，不受而去。善画山水人物，早期画工笔人物细密工致，“院人见其精描之笔，无不拜伏”，后来演变简括粗放，纵笔挥洒，被称作“折芦描”。粗放的“减笔”极富有创造性，粗粗几笔描画人物情态十分逼真。梁楷开创了中国画水墨写意画法的新局面，对后代写意画法的发展有很大的影响。 其作品“泼墨仙人”展现了水墨之墨韵的精湛美感，是一种简笔画的表现形象方式。

Liang Kai (Chinese:梁楷; pinyin:Liáng Kǎi; c. 1140 - c. 1210) was a Chinese painter of the Southern Song Dynasty. He was also known as Madman Liang. He was born in Shandong and worked in Lin An (later Hangzhou). He is known to have studied with the master Jia Shigu.