Richard Greenleaf Trefry (August 6, 1924 – February 25, 2023) was a lieutenant general in the United States Army.

Trefry began his Army career as an enlisted soldier and served in World War II before attending the U.S. Military Academy at West Point, New York where he received a commission in 1950 as a field artillery officer.

Noted for his teaching abilities, he was subsequently assigned as an instructor at the Engineer School at Fort Belvoir, Virginia.

In 1973 he was posted to Bangkok, Thailand, to be the deputy chief of the Joint U.S. Military Advisory Group.

He was then assigned as the defense attaché in Vientiane, Laos, where he contributed to the defeat of a coup d’état by exiled Laotian air force officers.