USS YP-400 was a seiner acquired by the U.S. Navy before completion during World War II to serve as a patrol boat.

[1] On 24 May 1942, she was acquired by the U.S. Navy[1] while still being built[2] and completed later in the year.

[1] She was designated as a Yard Patrol Craft (YP) and assigned to the 13th Naval District.

In 1946, she was transferred to the United States Maritime Commission; her ultimate fate is unknown.

This United States Navy article is a stub.