Mac or MAC may refer to:

• Martin's Air Charter, now Martinair
• Mean Aerodynamic Chord
• Merchant aircraft carrier, used during World War II by Britain and the Netherlands
• Metropolitan Airports Commission, the operator of airports in the Minneapolis-St. Paul area
• Military Airlift Command, the predecessor of the Air Mobility Command of the United States Air Force

The Macintosh Plus computer is the third model in the Macintosh line, introduced on January 16, 1986, two years after the original Macintosh and a little more than a year after the Macintosh 512K, with a price tag of US$2599. As an evolutionary improvement over the 512K, it shipped with 1 MB of RAM standard, expandable to 4 MB, and an external SCSI peripheral bus, among smaller improvements. It originally had the same generally beige-colored case as the original Macintosh ("Pantone 453"), but in 1987, the case color was changed to the long-lived, warm gray "Platinum" color. It is the earliest Macintosh model able to run System 7 OS.

MobileMe (formerly .Mac and iTools) was a subscription-based collection of online services and software offered by Apple Inc. All services were being gradually transitioned and replaced by iCloud and the service ceased as of June 30, 2012, with transfers to iCloud available until July 31, 2012. Afterwards, all data was deleted, and the email addresses of accounts not transferred to iCloud were marked as unused.