Caeli Sierra McKay Riendeau ( McKay, born 25 June 1999) is a former Canadian diver. She competed in the women's 10 metre platform event at the 2019 World Aquatics Championships. In June 2021, she qualified to represent Canada at the 2020 Summer Olympics. She finished fourth of the women's 10 metre platform event at the 2024 Summer Olympics.
McKay was featured on General Mills and Nestlé's Cinnamon Toast Crunch cereal lines packaging.
She is married to diver Vincent Riendeau.