USS Allegan (AK-225) was a Crater-class cargo ship commissioned by the U.S. Navy for service in World War II.

SS Van Lear Black was laid down under a Maritime Commission contract (MCE hull 2416) on 21 December 1943 at Baltimore, Maryland, by Bethlehem-Fairfield Shipyard; launched on 21 January 1944; sponsored by Mrs. Van Lear Black; acquired by the Navy under a bareboat charter on 7 August 1944; renamed Allegan and designated AK-225 on 12 August 1944; converted for naval service at Baltimore by the Maryland Drydock Co.; and commissioned on 21 September 1944.

Following shakedown training in the Chesapeake Bay, Allegan took on a cargo of pontoons at Davisville, Rhode Island, for transportation to the Philippines.

She paused en route at Manus, Admiralty Islands, on 30 January; then sailed on for California and reached San Pedro, Los Angeles, on 23 February.

The vessel reached San Francisco Bay on 5 September and, after a period of voyage repairs, got underway again on 6 October bound for Hampton Roads, Virginia.