Liu Songnian (刘松年 or traditional Liu Sung-nien, 1174–1224 CE), was a Chinese landscape painter during the early Southern Song Dynasty (1127–1279). He was active from about 1190-1230 and is considered one of the Four Masters of the Southern Song dynasty, which also included Li Tang, Ma Yuan and Xia Gui. He studied and worked at the Imperial Academy of Painting in Hangzhou, capital of the Southern Song dynasty.

Liu entered the Southern Song Imperial Academy of Painting as a student in 1189, and went on to become a painter-in-attendance from 1190 to 1194. During the reign of Emperor Ningzong of Song, he received a prestigious award for his work. Liu followed the tradition of Li Tang. Liu's style influenced the work of Ma Yuan and Xia Gui.

刘松年（？ - 约1225年后），时人呼之为暗门刘，南宋钱塘（今浙江杭州）人，居暗门（今杭州清波门）。

宋孝宗淳熙初画院学生，宋光宗绍熙（1190—1194年）年间画院待诏。师从张敦礼（张训礼），工画物、山水，笔墨精严、著色妍丽，多写茂林修竹、山明水秀之景，所作屋宇界画工整；兼画人物神情生动、衣褶清劲。宋宁宗（1195—1224年）年间进「耕织图」称旨，赐金带。

后人把他与李唐、马远、夏圭合称为「南宋四家」。传世作品有《罗汉》、《溪亭客话》、《四景山水》、《醉僧》、《天女献花》等。