Open

Open may refer to:

Philosophy

Openness, term being used to define the basis of how various groups and organizations operate

Open problem, a well-defined problem with no known solution in science and mathematics
Open set, set in topology and related fields of mathematics
Opening (morphology), an operator in mathematical morphology
Open map, a function that is open

Open (Shaznay Lewis album), 2004 album by Shaznay Lewis
Open (Blues Image album), Blues Image's second album
Open (Cowboy Junkies album), an album by the Canadian band Cowboy Junkies, released in 2001
Open (Gotthard album), the fourth studio album by the hard rock band Gotthard
Open (YFriday album), the second studio album from the Christian band YFriday, released in 2001
Open, 1967 album by Julie Driscoll, Brian Auger and the Trinity
Open (band), Australian pop/rock band
"Open", a song by The Cure on their album Wish
Open Season (film), a 2006 movie made in Sony Animation
Open...., the original interactive television service on BSkyBs Sky Digital platform
Open (Jon Anderson album), a 2011 album released through Digital Download

Open vowel, vowel sound of a type used in most spoken languages
Open (magazine), a lifestyle Mexican publication
OPEN (Indian magazine), an Indian weekly English language magazine featuring current affairs
Open: An Autobiography, by Andre Agassi (2010)

open (process), Nextstep & Mac OS X command line application that opens its argument(s) in the GUI as if the user had double clicked
Open-circuit voltage, in electronics, the absence of a load through which electric current would flow
Open-source software, computer software modifiable by all, where users are treated as co-developers
Open system (computing), computer systems that provide interoperability
Open (system call), standardized system call for opening files

Open (sport), type of competition in tennis, golf and other sports where entry is open to all qualifiers regardless of age or ability
Organization of Pakistani Entrepreneurs of North America, inclusive, not-for-profit organization
Open surgery as opposed to minimally invasive surgery