1980 Avon Championships of Chicago

The 1980 Avon Championships of Chicago was a women's tennis tournament played on indoor carpet courts at the International Amphitheatre  in Chicago, Illinois in the United States that was part of the 1980 Avon Championships Circuit. It was the ninth edition of the tournament and was held from January 21 through January 27, 1980. First-seeded Martina Navratilova won the singles title and earned $40,000 first-prize money.

Singles
🇺🇸 Martina Navratilova defeated 🇺🇸 Chris Evert-Lloyd 6–4, 6–4
 * It was Navratilova's 3rd singles title of the year and the 37th of her career.

Doubles
🇺🇸 Billie Jean King / 🇺🇸 Martina Navratilova defeated Sylvia Hanika / 🇺🇸 Kathy Jordan 6–3, 6–4