M
- Macintosh – Macintosh 128K
- Malibu – Macintosh Portable
- Marble – iBook G3 (Dual USB)
- Maui – Macintosh SE
- Maui – Macintosh SE FDHD
- Medusa2 – Power Mac G4 (Gigabit Ethernet)
- Mercury – PowerBook G4
- Mighty Cat – PowerBook 2400c
- Milwaukee – Macintosh II
- Minuet – Mac OS 9.0.4
- Monet – PowerBook 165c
- Montana – Macintosh Classic II
- Montana – Power Macintosh 7300
- Montana 7600 – Power Macintosh 7600
- Moonlight – Mac OS 9.2
- Mountain Lion – OS X 10.8
- Mozart – System Software 7.5
- Mr. T – Macintosh Plus
- Mustang – PowerBook 5300 Series
- Mystic – Power Mac G4 (Gigabit Ethernet)
- M2 – PowerBook 5300
- M23 – iMac G5 20"
- "M33" - Built-in iSight (2005)
- M52 – Apple Time Capsule
- M80 – System Software 7
Read more about this topic: List Of Apple Codenames