• Object-oriented programming, a computer programming paradigm
• Object-oriented positioning, another name for feature-oriented positioning in microscopy
• Order of operations, in mathematics, rules for which parts of an expression are evaluated first
• Out of print, a term referring to a book or other work that is no longer being published
• Alley Oop, a comic strip
• Alley oop, a basketball play
• Oop!, a software idea in Douglas Coupland's novel Microserfs

See also

• OOPS