B
- Beaker – Mac OS X PR2
- Becks – Macintosh II
- BHA (Butt-Head Astronomer) – Power Macintosh 7100
- Big Bang – System Software 7
- Big Bear – iPhone OS 2.0, 2.0.1, 2.0.2
- Big Deal – System Software 6
- Bismol – iBook
- Blackbird – Macintosh IIfx
- Blackbird – PowerBook 540, 540c, 550c, 500 with PowerPC
- Blackbird LC – PowerBook 520, 520c, 550c, 500 with PowerPC
- Blue – System Software 7
- BOB W (Best of Both Worlds) – PowerBook Duo 210, 230
- Bongo – Power Macintosh 5200 LC, 5300 LC
- Brazil 16c – Macintosh IIvx
- Brazil 32c – Macintosh IIvi
- Bride of Buster – Mac OS 8.1
- Brooks – PowerBook 160
- Bunsen Mac OS X DP3
Read more about this topic: List Of Apple Codenames