Allan Macdonald (November 21, 1794 White Plains, Westchester County, New York – January 1862) was an American politician from New York.
He was the son of Dr. Archibald Macdonald (d. 1813), a native of Scotland.
Allan Macdonald was Postmaster of White Plains from before 1825 until after 1833, and Sheriff of Westchester County from 1826 to 1828.
He was a member of the New York State Senate (2nd D.) from 1832 to 1835, sitting in the 55th, 56th, 57th and 58th New York State Legislatures.
He was Adjutant General of the New York State Militia from 1836 to 1838.
He was co-owner, with his brother Dr. James Macdonald (1803–1849), of a private insane asylum located since 1845 at Sanford Hall, the former residence of Chancellor Nathan Sanford (1777–1838) in Flushing, Queens.