USS Dahlgren (DD-187/AG-91) was a Clemson-class destroyer which served in the United States Navy during World War II.

Dahlgren joined the Atlantic Fleet for exercises and training along the United States East Coast, in Mexican waters, off Guantanamo Bay, Cuba, and in the Panama Canal Zone.

Destroyer operations engaged her along the United States West Coast until April 1934 when fleet exercises brought her to the Atlantic.

On 4 January 1942, Dahlgren arrived at Key West, Florida, to escort the battleship Washington in operations in the Gulf of Mexico.

She served the Mine Warfare Test Station at Solomons Island, Maryland, until 16 November 1945 when she moored at Philadelphia Navy Yard.