Harry M. Douglas (1919 – 1999) sometimes spelled as Douglass, was the lead singer of The Deep River Boys, an American gospel music group active from the mid-1930s and into the 1980s. Douglas lived on Sidway Place in Locust Manor/St. Albans Queens and in his later years was dedicated to community service in his Southeast Queens neighborhood.

With The Deep River Boys, Harry Douglas delighted audiences around the world for more than 30 years, and was featured on nine albums and many singles released by the group. The Deep River Boys performed twice at the White House and gave a Command Performance for Her Majesty, Queen Elizabeth II. In 2019, their 1941 single "They Look Like Men of War" was selected by the Library of Congress for preservation in the National Recording Registry for being "culturally, historically, or aesthetically significant".

Douglas was elected Vice-President of the Merrick Boulevard Local Development Corporation at its formation in 1980 and served in that capacity until his death. He was also instrumental in organizing the Springfield Gardens Business Merchants Association. He worked closely with the men and women of the 113th Police Precinct on a regular basis to address problems that confronted the community. Due to his leadership, grants for neighborhood improvements were provided by Federal, State and City agencies. As the architect of Project Lamb, he was responsible for the annual installation of holiday lights on the Merrick Boulevard shopping strip. Through his persistence under the banner of the Merrick Boulevard Local Development Corporation, Harry Douglas won approval for the Locust Manor Civilian Patrol and for the two neighborhood redevelopment contracts awarded to provide security and safety equipment for 46 merchants from Archer Avenue to Springfield Boulevard.