USS Oceanographer (AGS-3) was a survey ship of the United States Navy during World War II that produced charts chiefly of passages in the Solomon Islands area of the Pacific Ocean.

Corsair III, designed by John Beavor-Webb, was built in 1898 by T. S. Marvel Shipbuilding, Newburgh, New York, christened by the daughter of the owner, Miss.

On 17 October 1917, she assisted the torpedoed United States Army transport Antilles, picked up many of her survivors, and searched for the submarine which had attacked her.

Oceanographer conducted many offshore surveys and discovered many of the canyons incising the continental slope between the Georges Bank area and Cape Hatteras, North Carolina.

In January 1937, crewmembers of Oceanographer and Lydonia were detached to man Coast and Geodetic Survey launches under the direction of the Red Cross during flood relief efforts at Kenova, West Virginia.

After shakedown in the Chesapeake, Oceanographer steamed for New York 3 October to join a convoy en route to Cristóbal, Canal Zone.

She encountered a severe storm off Astoria, Oregon, necessitating further repairs at Winslow Marine Railway Co., Bainbridge Island, Washington.

Proceeding to Kodiak via the Inside Passage, she reported to the Alaskan Command with no sound or radar gear, a very short cruising radius, and limited potable water capabilities, considered generally unsuitable for Aleutian duty.

Graybill assumed command 2 March 1943 and the following day Oceanographer got underway for Pearl Harbor, where sound gear was installed and necessary alterations made.

Upon completion of the Havannah Passage charts the ship made three other surveys in the vicinity of Nouméa, erecting numerous beacons and planting many buoys.

Oceanographer decommissioned 22 September, was struck from the Navy Vessel Register 14 October, and, in accordance with the agreement executed with J. P. Morgan, Jr., broken up for scrap.