Sean Day is a Belgian-born Canadian-American professional ice hockey defenceman who is currently playing for the Syracuse Crunch of the American Hockey League (AHL) while under contract to the Tampa Bay Lightning of the National Hockey League (NHL). Day was selected by the Mississauga Steelheads fourth overall in the 2013 OHL Priority Selection. Day was drafted 81st overall in the third round of the 2016 NHL Entry Draft by the New York Rangers. After several years playing in the minor leagues, Day made his NHL debut in 2021 with the Lightning.

The Syracuse Crunch are a professional ice hockey team in the American Hockey League (AHL). They play in Syracuse, New York, at the Upstate Medical University Arena. They are the primary development affiliate of the National Hockey League's Tampa Bay Lightning.