Lea Polonsky (Hebrew: לאה פולונסקי; born 25 May 2002) is an Israeli swimmer. She competed in the women's 200 metre freestyle event at the 2020 European Aquatics Championships, in Budapest, Hungary. She represented Israel at the 2022 World Aquatics Championships held in Budapest, Hungary. She reached the semifinals in the women's 200 metre butterfly event and she also competed in the women's 200 metre individual medley where she did not advance to the semifinals. She also competed in several relay events.