The 1979 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 1979 Colgate Series.

[2] Sixth-seeded Billie Jean King won the title and earned $32,000 first-prize money.

By reaching the final Evonne Goolagong Cawley became the fourth female player to break the mark of $1 million in prize-money.

[2][1] Billie Jean King defeated Evonne Goolagong Cawley 6–4, 7–5