| Country: | Japan |
| Year: | 1978 |
| Champion: | Yakult Swallows (4) |
| Champion Games: | 68-46-16 |
| Runnerup: | Hankyu Braves (3) |
| Runnerup Games: | 82-39-9 |
| Date: | October 14–22 |
| Mvp: | Katsuo Osugi (Yakult) |
| Fsa: | Mitsuhiro Adachi (Hankyu) |
The 1978 Japan Series was the 29th edition of Nippon Professional Baseball's postseason championship series. It matched the Central League champion Yakult Swallows against the Pacific League champion Hankyu Braves. The Braves entered the series looking to win their fourth consecutive title, while the Swallows were making their first-ever Japan Series appearance. The Swallows defeated the Braves in seven games to claim their first championship.
| Game | Score | Date | Location | Attendance | |
|---|---|---|---|---|---|
| 1 | Swallows – 5, Braves – 6 | October 14 | Korakuen Stadium | 34,218[1] | |
| 2 | Swallows – 10, Braves – 6 | October 15 | Korakuen Stadium | 39,406 | |
| 3 | Braves – 5, Swallows – 0 | October 17 | Hankyu Nishinomiya Stadium | 20,296 | |
| 4 | Braves – 5, Swallows – 6 | October 18 | Hankyu Nishinomiya Stadium | 20,456 | |
| 5 | Braves – 3, Swallows – 7 | October 19 | Hankyu Nishinomiya Stadium | 18,298 | |
| 6 | Swallows – 3, Braves – 12 | October 21 | Korakuen Stadium | 44,956 | |
| 7 | Swallows – 4, Braves – 0 | October 22 | Korakuen Stadium | 36,359 |