Donald Campbell McRuer (March 10, 1826 – January 29, 1898) was an American politician from the Republican Party who served as U.S. Representative from California's 1st district from 1865 to 1867.

[1] During the Civil War, McRuer was a member of the United States Sanitary Commission.

He was elected as a Republican to the 39th United States Congress (1865–1867), but did not run for reelection.

McRuer traveled in Europe for two years, then returned to San Francisco.

This article about a member of the United States House of Representatives from California is a stub.