Buy may refer to a trade, i.e., an exchange of goods and services via bartering or a monetary purchase.

The term may also refer to:

• Buy (inhabited locality), any of several inhabited localities in Russia
• Burlington-Alamance Regional Airport, FAA airport code "BUY"
• Buy (river), a river in Perm Krai and the republics of Bashkortostan and Udmurtia in Russia
• Bunbury Airport, IATA airport code "BUY"

• Buy (album), 1979 album by James Chance and the Contortions
• Buy, slang for believe, find credible, be convinced
• Buy.com, a shopping website founded in 1997; renamed Rakuten.com in 2010

• Acquisition (disambiguation)
• Bui (disambiguation)
• Bouy (disambiguation)
• Buoy (disambiguation)
• Margherita Buy, an Italian actress
• Procurement
• Purchase (disambiguation)
• Purchasing
• Trade (disambiguation)