| British Open Squash Championships | |
| Number: | 40 |
| Series: | British Open Championships |
| Location: | London, England |
| Venue: | Wembley Squash Centre |
| Prevseason: | 1977 |
| Nextseason: | 1979 |
The 1978 Avis Rent-a-Car British Open Championships was held at the Wembley Squash Centre in London from 31 March - 8 April 1978.
Geoff Hunt won his fifth title defeating Qamar Zaman in the final.[1]
Geoff Hunt beat 
Qamar Zaman 7-9 9-1 9-1 9-2