AC3 or AC-3 may refer to:

Science and technology

Dolby AC-3 Dolby Digital, originally synonymous with Dolby AC-3, is the name for what has now become a family of audio compression technologies developed by Dolby Laboratories. Formerly named Dolby Stereo Digital until 1995, the audio compression is lossy ( ...

, Dolby Digital audio codec *

AC-3 algorithm In constraint satisfaction, the AC-3 algorithm (short for Arc Consistency Algorithm #3) is one of a series of algorithms used for the solution of constraint satisfaction problems (or CSP's). It was developed by Alan Mackworth in 1977. The earlier A ...

(Arc Consistency Algorithm 3), one of a series of algorithms used for the solution of constraint satisfaction problems * (35414) 1998 AC3, a minor planet * AC-3, an IEC utilization category * AC3 (All Content Creators Currency), a cryptocurrency aimed at content creators * Ambedkar Community Computing Center (AC3)

Transportation

* Comte AC-3, a 1920s Swiss bomber/transport aircraft * Southern Pacific class AC-3, a class of steam locomotive

Video games

* ''

Ace Combat 3 is an arcade-style combat flight simulation video game developed and published by Namco for the PlayStation. The third game in the ''Ace Combat'' franchise, it was released in Japan in 1999 and in Europe and North America in 2000. Players cont ...

'', part of the ''Ace Combat'' series of video games * ''

Armored Core 3 is a 2002 third-person shooter mecha video game developed by FromSoftware for the PlayStation 2. It is the sixth entry in the ''Armored Core'' series. ''Armored Core 3'' acts as a reboot for the franchise and begins a storyline that would continu ...

'', part of the ''Armored Core'' series of video games * ''

Assassin's Creed III ''Assassin's Creed III'' is a 2012 action-adventure video game developed by Ubisoft Montreal and published by Ubisoft for PlayStation 3, Xbox 360, Wii U, and Microsoft Windows. It is the fifth major installment in the ''Assassin's Creed'' series ...

'', part of the ''Assassin's Creed'' series of video games {{Letter-Number Combination Disambiguation