BATS may refer to:

• British American Tobacco, by stock symbol on the London Stock Exchange
• Bermuda Atlantic Time-series Study, oceanographic study in the Atlantic Ocean
• BATS Global Markets, a stock exchange
• BATS Theatre, a New Zealand theatre venue
• BATS Improv, an improvisational theatre company in San Francisco, United States

BAT may refer to:

• Bacula Administration Tool, an administration tool for the Bacula backup software
• Baby-AT computer case form factor, rarely abbreviated to BAT
• .bat, the filename extension used in DOS and Windows batch files
• Block Address Translation registers in PowerPC microprocessors

Bats are mammals of the order Chiroptera (; from the Greek χείρ - cheir, "hand" and πτερόν - pteron, "wing") whose forelimbs form webbed wings, making them the only mammals naturally capable of true and sustained flight. By contrast, other mammals said to fly, such as flying squirrels, gliding possums, and colugos, can only glide for short distances. Bats do not flap their entire forelimbs, as birds do, but instead flap their spread-out digits, which are very long and covered with a thin membrane or patagium.

"Bats!" is the debut single by the Los Angeles-based punk rock band The Bronx, released in 2003 by Tarantulas Records. It was produced by Beau Burchell and recorded at his home in Los Angeles. The single was released on both compact disc and 12-inch vinyl, the latter a picture disc limited to 1,000 copies. The B-side is backmasked, playing from the inner edge to the outer.