Claire Weinstein (born March 1, 2007) is an American Olympic freestyle swimmer, who swam for Las Vegas-based swim team the Sandpipers of Nevada.

At the 2022 World Aquatics Championships, Weinstein helped Team USA win the gold medal in the women's 4x200m freestyle relay.

She won the silver medal in the 4x200m freestyle relay, joined by Katie Ledecky, Paige Madden, and Erin Gemmell.

[2][3] For her Mitzvah project, she volunteered her time to help coach the younger swimmers in the Westchester Aquatic Club swim school at inter-team meets and practices, because of her passion for the sport and belief that everyone should learn to swim and have the opportunity to be a competitive swimmer if they desire.

[2][3] On her behalf a donation was made to the Christopher Dewey Memorial Swim Foundation to assist low-income swimmers.

[15] At the 2023 U.S. Championships, at 16 years of age Weinstein won the 200m freestyle in 1:55.26 (making her the 24th-fastest woman at the distance in history), defeating seven-time Olympic swimmer Katie Ledecky.

[20] Among American women, only Allison Schmitt (1:53.61), Ledecky (1:53.73), and Missy Franklin (1:54.81) had swum times faster than Weinstein’s 1:54.88.