John Edward Reinhardt (March 8, 1920 – February 18, 2016) was an American ambassador and diplomat.

Reinhardt was born in Knoxville, Tennessee. He attended the University of Chicago, initially pursuing a graduate degree in English, but did not finish on account to serving in World War Two. His doctorate in English was completed at the University of Wisconsin. He was the American ambassador to Nigeria from 1971 to 1975, becoming one of the first black ambassadors. From 1975 to 1977, he was Assistant Secretary of State for Public Affairs. He became the director of the United States Information Agency from 1977 to 1980. Reinhardt later was a professor of political science at the University of Vermont from 1987 to 1991.

On June 16, 2004 he joined a group of twenty seven called Diplomats and Military Commanders for Change opposing the Iraq War.