Burt Leavelle Monroe Jr. (25 August 1930 – 14 May 1994, in Louisville, Kentucky) was an American ornithologist, a professor at the University of Louisville, a member of the American Ornithologists' Union (AOU) beginning in 1953.
Among his major contributions to avian taxonomy was the work with Charles Sibley resulting in the so-called Sibley-Monroe classification.
He obtained a bachelor's degree in biology at the University of Louisville and then joined the US Navy from 1953 to 1959 rising to become a Lieutenant and working as a flight instructor at Pensacola.
He then joined the Louisiana State University and worked on expeditions to collect birds in Honduras.
After seeing his father die from a heart attack during an audit of the AOU, he took up in 1968 the role of treasurer.