John Moorehead Clark (August 10, 1821 – June 22, 1902) was an American politician who served as Suffolk County Sheriff from 1855 to 1883.

[1] On March 31, 1855, Clark was appointed sheriff of Suffolk County, Massachusetts, by Governor Henry Gardner.

On September 11, 1862, Appleton Oaksmith, who had been convicted of fitting out a vessel for the slave trade escaped from Charles Street Jail and fled to England.

[3] During the American Civil War, Clark, an abolitionist, served as chairman of the Ward 5 committee to secure voluntary enlistment and provide money to soldiers' families during their absence.

[2] Clark was also a member of the Massachusetts Light Infantry and was detailed to defend Fort Warren in 1861.

[1] He was one of two men sent by governor John Albion Andrew, to represent Massachusetts at the dedication of the Gettysburg National Cemetery on November 19, 1863.

George L. Clark was a millionaire real estate man and a member of the Massachusetts House of Representatives in 1883 and 1884.

[1] Clark was a 32nd degree Freemasonry and served as the leader of the De Molay commandery of the Knights Templars from 1872 to 1876.