A boatswain's mate is a petty officer assisting the boatswain aboard ship.
Specifically, boatswain's mate may refer to:
- Boatswain's mate (United States Navy), a job classification in the United States Navy
 - Boatswain's mate (United States Coast Guard), a job classification in the United States Coast Guard
 - Boatswain's mate (National Oceanic and Atmospheric Administration), a job classification in the United States National Oceanic and Atmospheric Administration
 - Bootsmannsmaat, a historical naval rank in Austria, Germany, and Russia
 - The Boatswain's Mate, a 1914 one-act opera by Ethel Smyth
 
See also
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