• Mate, one of a pair of animals involved in mating
• A deck officer aboard a merchant ship, such as the Chief Mate, Second Mate, or Third Mate; also (between 1840 and 1860) the rank now known as a Sub-Lieutenant
• Mate (colloquialism), a colloquialism used to refer to a friend and is commonly used in the United Kingdom, Australia, New Zealand, South Africa and Ireland
• Maté, the popular caffeinated beverage made from the yerba maté
• Mahte, a goddess in Latvian mythology, also spelled "Māte"
• MATE, the Marine Academy of Technology and Environmental Sciences, a specialized high school in Manahawkin, NJ

Chess

• Short for checkmate, a winning/losing situation in chess

Cuisine

• Maté, the popular caffeinated beverage made from the yerba maté
• Yerba maté, a South American herb used to make Maté
• Mate de coca, a beverage made from coca

Naval uses

• A deck officer aboard a merchant ship, such as the Chief Mate, Second Mate, or Third Mate
• A rank used between 1840 and 1860, which is now known as a Sub-Lieutenant
• The word "mate" is used in a number of naval ratings, such as Boatswain's Mate, Gunner's Mate, and shipmate.

Politics

• Mate Granić, Croatian diplomat and politician
• Running mate, a fellow candidate for the same party in one election

Other fields

• Mate of Origin, a rugby based competition played in New Zealand
• Mate Tusanga, a non-profit online mathematical tool
• Sébastien Mate, French footballer
• Vasiliy Mate (1856–1917), Russian artist and engraver
• Mate Recordings, a record label
• MATE, a Martial Arts Technique Expert