USS Sidonia (AKA-42) was an Artemis-class attack cargo ship in service with the United States Navy from 1945 to 1946.

On 22 August, Sidonia's starboard engine was disabled by an electrical ground, and it remained out of commission during the rest of the ship's career.

Sidonia arrived at Lingayen Gulf on 31 August and disembarked her troops and cargo.

The ship arrived at Manila on 29 September and departed on 7 October with 322 homeward-bound servicemen, whom she disembarked at Portland, Oregon, on 9 November.

Sidonia was decommissioned at Everett, Washington, on 25 February 1946; struck from the Navy list on 17 April 1946; and transferred to the War Shipping Administration on 29 June 1946 for retention in the National Defense Reserve Fleet at Olympia, Washington.