Mod, MOD or mods may refer to:

Places
 Modesto City–County Airport, Stanislaus County, California, US

Arts, entertainment, and media

Music
 Mods (band), a Norwegian rock band
 M.O.D. (Method of Destruction), a band from New York City
 The Mods (band), a punk rock band from Toronto
 Circuit bending, modification of an existing circuit such as a guitar pedal, digital keyboard, or drum machine

Other uses in arts, entertainment, and media
 Mod (movie), 2011 movie
 The Mods (movie), 2014 movie
 Mod (video games), changes  to a video game, usually by persons not associated with the main developers, which may affect visuals, gameplay, and other aspects
 Mòd, a festival of Scottish Gaelic song, arts and culture
 Media-on-demand, a new generation of video on demand
 MuchOnDemand, a music-television show that airs on MuchMusic in Canada

Brands and enterprises
 Mod Club Theatre, a nightclub in Toronto, Canada
 MOD Pizza, a fast casual pizza restaurant chain based in the United States

Organizations
 MoD (UK), the UK Ministry of Defence
 Masters of Deception, a US-based hacker group
 Ministry of Defence, a part of the government responsible for defence
 Ministry of Development (Brunei), a Bruneian government ministry

Science and technology

Computing and Internet
 Mod, a module for Apache HTTP Server
 Case modding, the modification of a computer chassis
 Forum moderator, a person who watches over an Internet message board
 Module file, a family of computer music formats which play patterns of embedded sound samples
 MOD (file format), the first module file format
 Source code file (for an implementation module) in the programming language Modula-2

Mathematics
 Mod n cryptanalysis, a partitioning attack applicable to block and stream ciphers
 Modulo (mathematics), a mathematical term
 Modular arithmetic, a system of arithmetic for integers where numbers return to zero after a certain value
 Modulo operation, the remainder of division of one number by another
 Modular exponentiation, a type of exponentiation performed over a modulus
 Remainder, the "left over" part in division of integers which cannot be expressed with an integer quotient

Other uses in science and technology
 Mod, a type of electronic cigarette
 MOD and TOD, a tapeless video format by JVC
 Modchip, a device designed to modify the behavior of an electronic system
 Model organism database, a database that houses and disseminates organism-specific biological knowledge
 Multiple organ dysfunction syndrome, a medical condition

Other uses
 MOD (Marehan, Ogaden, Darawiish)
Mod (subculture), 1960s British youth subculture
 Mod revival, a rebirth of the mod subculture in the late 1970s
 MOD, a basic unit of time used in the MODAPTS predetermined motion time system
 Body modification, the deliberate altering of the human body for non-medical reasons
 Honour Moderations, a first set of examinations at Oxford University
 Manufactured-on-demand, such as Warner Archive Collection
 Maximum operating depth, in scuba diving, the depth at which a gas mix exceeds safe limits
 Mod Cup, a trophy in the sport of shinty first competed for in 1969
 Modular scheduling, a system of school timetabling
 Multicultural organization development