Nancy Lynn Thies (born June 10, 1957) is a retired American gymnast.

Aged 15, she competed in six events at the 1972 Summer Olympics with the best individual result of 27th place on the balance beam.

After graduating from the University of Illinois she became an author and journalist, working in public relations.

She also served as vice-chair for women at USA Gymnastics, headed the USA Gymnastics athlete wellness program, and occasionally acted as a commentator for gymnastics-related TV broadcasts.

This biographical article related to a United States artistic gymnast is a stub.