The Mac Mini (marketed as Mac mini) is a small form factor desktop computer manufactured by Apple Inc. Like earlier mini-ITX PC designs, it is quite small for a desktop computer: 7.7 inches (19.7 cm) square and 1.4 inches (3.6 cm) tall. It weighs 2.7 pounds (1.22 kg). Prior to the mid-2011 revision, all models, except the mid-2010 server model, came with an internal optical disc drive. Models prior to 2010 used an external power supply and were narrower but taller at 2 × 6.5 × 6.5 inches (50.8 × 165.1 × 165.1 mm). The Mac Mini is one of three desktop computers in the current Macintosh lineup, the other two being the iMac and Mac Pro, although it generally uses components usually featured in laptops, hence its small size.

The Mac Mini was the first consumer level Macintosh desktop to ship without a display, keyboard, or mouse since Apple's success following the release of the iPod, with Apple marketing it as BYODKM (Bring Your Own Display, Keyboard, and Mouse) to reinforce this fact. The primary intended market for the Mac Mini was users switching from a traditional Windows PC to a Mac who might already own a compatible display, keyboard and mouse, though these could be easily purchased if needed. A special Server version of the computer is also intended for use as a server in a small network, and beginning with the mid-2010 revision, all Server models include the Server edition of the OS X operating system.

The updated unibody Mac Mini is notable as Apple's first computer to include an HDMI video port to connect to a television or other display, more readily positioning the unit as a home theater device alternative to the Apple TV.