Henry Glass (January 7, 1844 – September 1, 1908) was a rear admiral in the United States Navy, best remembered for his role in the bloodless capture of Guam in the Spanish–American War.

Glass was born in Hopkinsville, Kentucky, and entered the Naval Academy in 1860, graduating a year ahead of schedule with the rank of ensign on May 28, 1863.

Also while serving in Mohican, he performed duty as an aide on the staff of the Commander of the Pacific Squadron, Rear Admiral John Lorimer Worden.

Returning to the Navy on March 3, 1879, Jamestown was refitted at Mare Island and sailed from San Francisco for Alaska on May 22, 1879, to protect American lives and property threatened by "the disturbed condition of affairs" on shore.

Promoted to commander on October 27, 1879, Glass served as the senior naval officer in Alaskan waters in charge of Indian affairs in that territory in 1880.

As the island was virtually undefended—the forts were in ruins—the Spanish governor surrendered; and Glass took possession of Guam for the United States on the afternoon of June 21, 1898.

As the orders specified, Charleston proceeded on to Manila and participated in the operations that resulted in the surrender of that city in August 1898 and took part in the initial actions against Filipino "insurgents" who were resisting America's assumption of control in the Philippine Islands.

W. H. Whiting, Glass returned to the United States and soon assumed command of the naval training station at San Francisco, California, on January 23, 1899.

During his tour of duty in command of the squadron, the flagship, New York, together with the cruiser Marblehead and screw steamer Fortune visited Adak and Kiska, in the Aleutian Islands, conducting surveys of the latter place in July 1903 with an eye toward establishing a coaling station there.