McCulloch (1897–1967), British radio broadcaster known as "Uncle Mac" Ian McCulloch (singer) (born 1959), commonly referred to as "Mac the Mouth" or just "Mac" Stanley McMurtry (born 1936), British cartoonist with the pen name "Mac" Places Inhabited places Fort McMurray, Alberta, Canada, nicknamed "Fort Mac" Macau, a special administrative region of the People's Republic of China, ISO 3166 code MAC Macedonia (disambiguation), various places Museums and arts centers mac (Birmingham), formerly known as the Midlands Arts Centre, in Birmingham, UK Metropolitan Arts Centre, Belfast, UK Archaeology Museum of Catalonia (Museu d'Arqueologia de Catalunya), an archaeology museum in Catalonia, Spain Niterói Contemporary Art Museum (Museu de Arte Contemporânea de Niterói), a museum in Niterói, Brazil Other facilities Macomb (Amtrak station), Illinois, United States, Amtrak station code MAC UCLA Marina Aquatic Center, a recreational facility in Marina del Rey, California Science and technology Biology and medicine MAC (chemotherapy), a chemotherapy regimen of Mitoxantrone and Ara-C Maximum allowable concentration, a concept related to threshold limit value (TLV) Membrane attack complex, an immune system function using complement Microbiota-accessible carbohydrates, a category of carbohydrates consumed by gut microbes Minimum alveolar concentration, a measure used to compare the strengths of anesthetic vapors Mitochondrial apoptosis-induced channel, the cytochrome c release pore of apoptotic mitochondria Monitored anesthesia care, a form of anesthesia with partial awareness Mycobacterium avium complex, a group of environmental pathogens Computing and telecommunication MAC address, or Ethernet Hardware Address (EHA), the OSI layer 2 address of network interfaces .mac, a file extension for macros in Agilent ChemStation software Mac (computer), a brand of computers and computer operating systems made by Apple Inc. macOS, formerly Mac OS X and OS X, Apple's current operating system for Mac computers Classic Mac OS, the original operating system for Apple's Macintosh .Mac, now iCloud, a subscription service by Apple MAC times, metadata which record times of events associated with a computer file Mandatory access control, a type of access control in computer security Maximum activate count, a parameter associated with the LPDDR4 memory's TRR feature that mitigates the row hammer effect Medium access control (often "Media Access Control"), a sublayer of the Data Link layer Message authentication code, used to authenticate a message in cryptography Migration Authorisation Code, a unique code used when switching between DSL Internet service providers in the UK Multiplexed Analogue Components, a proposed satellite television transmission standard Multiply–accumulate operation, or multiplier–accumulator, in digital signal processing