Harold Dunbar Cooley (July 26, 1897 – January 15, 1974) was an American politician of the Democratic Party.

He was a private practice lawyer and military veteran, serving in the United States Naval Aviation Flying Corps during World War I.

He was a member of the Interparliamentary Conferences held at Cairo, Egypt, 1947 and at Rome, Italy, 1948 and served as president of the American group for two four-year terms.

Cooley remains the longest-serving Chairman of the House Committee on Agriculture in history.

[11] He died on January 15, 1974, in Wilson, N.C. and is buried in Forest Hill Cemetery, Nashville, N.C. His home at Nashville, the Bissette-Cooley House, was listed on the National Register of Historic Places in 1985.