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

• Boatswain (disambiguation)

This disambiguation page lists articles associated with the title Boatswain's mate.
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