The name USS A-1 may refer to the following ships of the United States Navy:

• USS Plunger (SS-2), the lead ship of Plunger class submarine series
• USS A-1 (SP-1370), a houseboat taken over by the United States Navy in 1917

See also

• A1#Seacraft, for other ships named A1

This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.