| History | |
|---|---|
 United States | |
| Name | USS Mary Louise |
| Namesake | Previous name retained |
| Builder | Milton Point Shipyard, New York |
| Acquired | 24 August 1917 |
| In service | 27 August 1917 |
| Fate | Returned to owner 30 October 1917 |
| General characteristics | |
| Type | Patrol vessel |
| Length | 47 ft 10 in (14.58 m) |
| Beam | 9 ft 6 in (2.90 m) |
| Draft | 4 ft (1.2 m) |
| Speed | 8 knots |
USS Mary Louise (SP-356) was a patrol boat that served in the United States Navy from August to October 1917.
Mary Louise was built as a private boat of the same name in by the Milton Point Shipyard in New York. On 24 August 1917, the U.S. Navy acquired her on a free-lease basis from her owner, J. S. Williams of Wilmington, North Carolina, for use as a patrol boat during World War I. She was placed in service as USS Mary Louise (SP-356) on 27 August 1917.
Assigned to the 6th Naval District, Mary Louise served on section patrol duties for about two months.
Mary Louise was returned to her owner on 30 October 1917.