- Defamation League
- Defame
- Defao
- Defao Matumona
- Defao & The Big Stars
- Defari
- Defasylum
- Default
- Default Outfit
- Default Settings
- DefCiphur
- Defcom
- Defcon
- Defcon 3000
- Defcon 4
- Defcon 5
- Defcon 6
- Defcon 97
- Defcon Five
- Defcon Nine
- Defcon Situation 1
- Defconn
- DefDaf
- DefDFires
- Defeated Sanity
- Defeater
- Defeatist
- Defecation
- DEFECT DATA