Major-General Sir William Erskine, 2nd Baronet (30 March 1770 – 1813) was an officer in the British Army, served as a member of Parliament, and achieved important commands in the Napoleonic Wars under the Duke of Wellington, but ended his service in insanity and suicide. He was the eldest son of Lieutenant-General Sir William Erskine, 1st Baronet and his second wife, Frances. He succeeded to the baronetcy on his father's death in 1795.