Wei Yan (died 234), Wenchang, was a military general of the state of Shu Han during the Three Kingdoms period. Originally a foot soldier under the warlord Liu Bei (the founding emperor of Shu), Wei Yan rose through the ranks and became a general when Liu Bei invaded Yi Province (益州; covering present-day Sichuan and Chongqing) in 211. His talent and performance during battles helped him to become a prominent figure in the Shu military in a short period of time. He was later appointed as the Administrator of Hanzhong and as an Area Commander in 219. Between 228 and 234, he participated actively in the Northern Expeditions led by the Shu Zhuge Liang against Shu's rival state, Cao Wei. After Zhuge Liang's death in 234, Wei Yan was killed by another Shu general, Ma Dai, for alleged treason.