The 1980 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 AAAA[a] category of the 1980 Colgate Series.

It was the eighth edition of the tournament and was held from 8 September through 14 September 1980.

First-seeded Billie Jean King won the title and earned $34,000 first-prize money.

[2][1] Billie Jean King defeated Terry Holladay 7–5, 6–4