Isadora Marie Williams (born 8 February 1996) is a Brazilian-American figure skater who represents Brazil in ladies' singles.

She has Brazilian citizenship through her mother, who is from Belo Horizonte, Minas Gerais, and also lived in Brazil for two years as a child.

As a result of her placement, Brazil received one of the six remaining spots for countries which had not previously qualified for a ladies' entry.

In the 2016-2017 season, Williams earned the first gold medal for a Brazilian skater in an international competition at the 2017 Sofia Trophy.

[9] During the Olympic tournament, Williams made history by finishing 17th in the short program, enough to become the first Brazilian and South American to ever take part in the skating final.

In 2021, Williams failed to qualify to the Olympic Games for a third time after withdrawing from the free skating at Nebelhorn, where she placed 32nd after the short program.