1978 Toray Sillook Open
The 1978 Toray Sillook Open was a women's singles tennis tournament played on indoor carpet courts at Yoyogi National Gymnasium in Tokyo in Japan. The event was part of the AAA category of the 1978 Colgate Series. It was the sixth edition of the tournament and was held from 14 September through 17 September 1978. First-seeded Virginia Wade won the title and earned $20,000 first-prize money.
Finals
Singles
Virginia Wade defeated Betty Stöve 6–4, 7–6- It was Wade's 2nd title of the year and the 54th of her career.
Prize money
| Event | W | F | 3rd | 4th | Round of 16 | Round of 32 |
| Singles | $20,000 | $10,000 | $6,250 | $5,500 | $2,500 | $1,500 |