Format is a double-disc compilation album by English synth-pop duo Pet Shop Boys.

The album consists of B-sides from various singles released from 1996 to 2009 (Bilingual to Yes, or "Before" to "Did You See Me Coming?").

It is their second B-sides album after Alternative (1995), which collected B-sides from the time of their first version of "Opportunities (Let's Make Lots of Money)" (1985) to "Yesterday, When I Was Mad" (1994).

The album's release was initially announced in November 2011, then officially on 19 December 2011 through the Pet Shop Boys' official website, offering it for pre-order.

[3] All tracks are written by Neil Tennant and Chris Lowe, except "We're the Pet Shop Boys", written by My Robot Friend, and "Screaming", written by Chris Lowe, Neil Tennant, and Tom Stephan