| Casualty | |
|---|---|
| Series 4 | |
| No. of episodes | 12 |
| Release | |
| Original network | BBC One |
| Original release | 8 September – 1 December 1989 |
| Series chronology | |
The fourth series of the British medical drama television series Casualty commenced airing in the United Kingdom on BBC One on 8 September 1989 and finished on 1 December 1989.