Open

Open or OPEN may refer to:

Music

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, tennis player Andre Agassi's 2009 memoir

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
Open set, in mathematics
Open interval, in mathematics
Open line segment, in mathematics
Open map, in mathematics

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, a not-for-profit organization
One-Pair Ethernet, a specification of the OPEN Alliance SIG
Open Cycle, a bicycle manufacturer