Orlan Pliny Whitcomb (December 18, 1831 – February 7, 1898) was an American farmer and politician who served as the third state auditor of Minnesota from 1873 to 1882 as a member of the Republican Party.
Whitcomb was born in Granville, New York. He settled in Rochester, Minnesota Territory on a farm in 1855. He served as county treasurer from 1861 to 1869. Whitcomb served as Minnesota State Auditor from 1873 to 1882. He died in Mankato, Minnesota.