Casey Mittelstadt (born November 22, 1998) is an American professional ice hockey forward who currently plays for the Buffalo Sabres of the National Hockey League (NHL). Mittelstadt was born in Edina, Minnesota, but grew up in Eden Prairie, Minnesota. He was drafted by the Buffalo Sabres 8th overall in the 2017 NHL Entry Draft.
Mittelstadt attended Eden Prairie High School and was chosen as ALL-USA Boys Hockey Player of the Year in 2016 and 2017. He was named Mr. Hockey, the best high school senior hockey player in Minnesota, in 2017. He was drafted in the first round, eighth overall, by the Buffalo Sabres in the 2017 NHL Entry Draft.
Mittelstadt having committed to a collegiate career, played as a freshman forward on the 2017–18 Minnesota Golden Gophers team. After ranking second on the team, and seventh among all NCAA freshmen, with 30 points Mittelstadt was selected for the Big Ten All-Freshman Team. He was also selected as a finalist for Freshman of the Year, along with Quinn Hughes and Mitchell Lewandowski, with the award eventually going to Lewandowski.