Ralph Hill (October 12, 1827 – August 20, 1899) was an American educator, lawyer, and politician who served one term as a United States representative from Indiana from 1865 to 1867.

Hill was born in Trumbull County, Ohio, where he attended the district school.

He also attended the Kinsman Academy and the Grand River Institute in Austinburg, Ohio.

He established a select school at Austinburg in November 1851 before he resumed the practice of law in Jefferson, Ohio, in March 1852.

Upon leaving Congress, he served as the collector of internal revenue for the third district of Indiana from 1869 to 1875.