Rear Admiral Asa Walker (1845–1916) was a career officer in the United States Navy in the late nineteenth and early twentieth centuries.

He commanded the gunboat USS Concord (PG-3) at the Battle of Manila Bay and served as superintendent of the United States Naval Observatory.

[1][2] After graduating he served more than a year on the USS Sacramento, from which he was assigned to the Portsmouth Navy Yard as an ordnance officer.

Late in 1873 he returned to the Naval Academy, where he was posted until 1876, when he was sent to the South Atlantic station, serving on the Essex for three years.

In October 1900, he became a member of the Navy Examining Board in Washington, D.C., and served until 1901 when he assumed command of the cruiser USS San Francisco.

[2] He was promoted to rear admiral on January 7, 1906, and on February 28, 1906, he was appointed superintendent of the United States Naval Observatory in Washington, D.C.