USS Grayling (SS-209) was a submarine of the United States Navy, an SS boat whose work was submerged patrol.
On 4 June 1942 she was at sea for the Battle of Midway. Her station that day was the patrol line west of Midway.
Twelve boats made up that line, and Grayling was one of them. They held the submarine patrol to the west of the island while the battle was fought.
She served on the Midway patrol line, and the sinking that ended her did not happen there. The boat was still afloat after 4 June 1942. She is missing from September 1943. From that month she is presumed lost off Luzon.
Her fate is sunk. The ship that sank her is not known, and the loss stands as a disappearance off Luzon beginning in September 1943.