The Auk class were a class of 93 minesweepers serving with the United States Navy and the Royal Navy during World War II.
Prior to the United States entering World War II, they had produced two ships of the for testing. From these two examples it was decided that the use of diesel-electric engines to power the ship and the minesweeping equipment, rather than separate geared diesel engines to propel the ship and diesel generators to operate the minesweeping equipment, would work better. The Royal Navy placed an order for 32 of these minesweepers from the United States, BAM-1 â BAM-32. Because of the additional equipment, the displacement was raised from on the Ravens, to on what would come to be known as the Auk class in the USN, and the Catherine class in the RN.
The Auk class displaced 890 long tons, with a length of , a beam of , and a draft of . They had a maximum speed of . The Auks armament varied. All were equipped with a gun on the bow, but many had their aft 3-inch gun removed or replaced by two Bofors guns. Originally designed with four Oerlikon cannon, some ships mounted as many as eight.
Five manufacturers provided the diesel-electric engines used in the class. These included the Cleveland Diesel Engine Division of General Motors, Cooper Bessemer, Baldwin Locomotive Works, the American Locomotive Company (ALCO) and Busch-Sulzer. Twenty of the original 32 ships ordered by the Royal Navy were delivered, with an additional two coming from the USN program. They were given "J" pennant number prefixes. Of these twenty-two, three were sunk in action and 19 were returned to the US after the war. Eleven minesweepers of the Auk class were lost in the war, six to direct enemy action including , torpedoed by .
At least two vessels were in service in February 2026, in the Mexican Navy, Mariano Matomoros (ex-USS Sage) and Valentine Gómez Farias (ex-USS Starling).
The ships were constructed in 11 shipyards, by 10 companies, in 9 states.