Meng Da (pronunciationⓘ; died c. March 228[1]), courtesy name Zidu, was a military general of the state of Cao Wei during the early Three Kingdoms period of China.

Meng Da originally served Liu Zhang, the governor of Yi Province (covering present-day Sichuan and Chongqing).

Liu Bei sent Meng Da to guard Jiangling (江陵), and promoted him to Administrator (太守) of Yidu (宜都) later after settling Yi Province.

Liu Ye advised Cao Pi, "Meng Da is always looking out for rewards which are not rightfully his, and he is prone to schemes due to his talent.

[3] Meng Da became close friends with the Wei officials Huan Jie and Xiahou Shang.

After some exchanging of letters between Zhuge Liang and Meng Da, the latter gradually developed animosity towards Wei and harboured the intention of starting a rebellion.

Sima Yi's forces arrived at Xincheng in just eight days and caught Meng Da completely off guard.

Meng Da was betrayed by his nephew Deng Xian (鄧賢) and subordinate Li Fu (李輔) and his rebellion was swiftly suppressed.