Richard Henry Long (1865–1957) was an American businessman and politician who was the Democratic nominee for Governor of Massachusetts in 1918 and 1919.

[5] He briefly left the Democratic Party in 1912 to challenge John W. Weeks for the Republican nomination in Massachusetts's 13th congressional district.

He defeated William A. Gaston and Barry in a close 3-way Democratic primary, but lost the general election to Republican Calvin Coolidge 51% to 47%.

[11][12] He ran again in 1919 and easily won the Democratic primary over Eugene Foss, George F. Monahan, and Frederick Simpson Deitrick with 68% of the vote.

[16] By 1920, Long no longer supported the Wilson administration, stating that it was "demoralizing the Democratic Party".

[18] On July 10, 1920, Mabelle Long was a passenger in a plane that crashed in Salisbury, Massachusetts, en route from Franklin Field to Hampton, New Hampshire.

She was found alive at the scene but died by the time she reached Anna Jaques Hospital in Newburyport, Massachusetts.

[3] On July 17, 1921, Long married Laura Bosqute, a stenographer in his Worcester office, in a private ceremony.