Open - What Is Open Source Software

O or OPEN may refer to:

• Open (film), a 2011 film
• Open (sport), type of competition in tennis, golf and other sports where entry is open to qualifiers regardless of amateur or professional status
• Open...., the original interactive television service on BSkyBs Sky Digital platform
• Online Protection and Enforcement of Digital Trade Act, a bill in the United States Congress to combat online piracy
• Organization of Pakistani Entrepreneurs of North America, inclusive, not-for-profit organization
• The One-Pair Ethernet specification of the OPEN Alliance SIG
• OPEN Cycle, bicycle manufacturer
• The German name of Opin, Poland

Recorded music

• Open (band), Australian pop/rock band
• The Open (band), English indie rock band
• Open (Blues Image album), 1969
• Open (Gotthard album), 1999
• Open (Cowboy Junkies album), 2001
• Open (YFriday album), 2001
• Open (Shaznay Lewis album), 2004
• Open (Jon Anderson EP), 2011
• Open (Stick Men album), 2012
• Open (The Necks album), 2013
• Open, 1967 album by Julie Driscoll, Brian Auger and the Trinity
• Open, 1979 album by Steve Hillage
• "Open", the first song on The Cure's 1992 album Wish)

Books and magazines

• Open (Mexican magazine), a lifestyle Mexican publication
• OPEN (Indian magazine), an Indian weekly English language magazine featuring current affairs
• OPEN (North Dakota magazine), an out-of-print magazine that was printed in the Fargo, North Dakota area of the U.S.
• Open: An Autobiography, Andre Agassi's 2010 memoir

Computing

• open (process), a program launcher invoked from the command line in NeXTSTEP or Mac OS X
• open (system call), standardized system call for opening files