DEF II
| Network | BBC Two |
|---|---|
| Launched | 9 May 1988 |
| Closed | 23 May 1994 |
| Country of origin | United Kingdom |
| Key people | Janet Street-Porter |
| Format | Programming to serve the teenage market |
| Original language(s) | English |
DEF II was a programming strand on BBC2, which aired at 6 pm on Mondays and Wednesdays from 9 May 1988 to 23 May 1994, to serve the teenage market. It was produced by Janet Street-Porter, and followed on from her influential youth TV show Network 7 on Channel 4.
Many of the presenters and staff on DEF II started their careers on Network 7 and had followed Street-Porter when she was "poached" by the BBC. It had an ident featuring a barcode which differed from the usual idents used on BBC2.