| 1978 Fred Perry Japan Open | |
|---|---|
| Date | 23–29 October |
| Edition | 6th |
| Category | Grand Prix |
| Draw | 48S / 24D |
| Prize money | $100,000 |
| Surface | Clay / outdoor |
| Location | Tokyo, Japan |
| Champions | |
| Singles | |
 Adriano Panatta | |
| Doubles | |
 Geoff Masters / Ross Case | |
The 1978 Fred Perry Japan Open, also known as the Japan Open Tennis Championships, was a men's tennis tournament played on outdoor clay courts in Tokyo, Japan and part of the 1978 Colgate-Palmolive Grand Prix. It was the sixth edition of the tournament and was held from 23 October through 29 October 1978. Fourth-seeded Adriano Panatta won the singles title.
