John Rustgard (21 October 1863 – 12 February 1950) was a Norwegian-American lawyer and politician who served as the 3rd Attorney General of the Alaska Territory as a member of the Republican party from 1920 to 1933.

Rustgard moved to Juneau in 1908 and served as the U.S. District Attorney in the First Judicial Division from 1910 to 1914 before returning to practice private law.

Rustgard also ran in the Republican Primary for the office of Delegate to the U.S. House of Representatives from Alaska Territory's at-large district, but lost to James Wickersham.

[3][4][5] Following the end of his term as state Attorney General in 1933, Rustgard spent 18 months in Europe before retiring to Babson Park, Florida in 1936.

Rustgard wrote a number of books, including: The problem of poverty (1936), Sharing the wealth (1937) and The bankruptcy of liberalism (1942).