Frederick Clarence Buck (c. 1843 – July 15, 1905) was a United States soldier who fought with the Union Army as a member of the 21st Connecticut Infantry Regiment during the American Civil War.

Attached to the Union forces participating in operations against Petersburg and Richmond for much of the spring and summer, they were involved at Swift Creek, Fort Darling, the Battle of Drewry's Bluff, Bermuda Hundred, and White House before fighting in battles near Cold Harbor for much of June and in the trench warfare at Bermuda Hundred from late August through late September 1864.

At the Battery barracks the soldiers were gladdened by a plentiful supply of strawberries furnished them by Col. ALMY, State Agent.In 1890, Buck resided at 26 Emerald Street in Boston, Massachusetts.

[5] Suffering from heart disease in his later years, Buck was admitted to the Mountain Branch of the U.S. National Homes for Disabled Volunteer Soldiers in Johnson City, Tennessee on March 13, 1905.

The hospital ledger noted that he had been a 61-year-old, unmarried laborer and member of the Protestant faith residing in Patten, Maine prior to his admission, and that he was 5' tall with brown hair, hazel eyes and a dark complexion.