John St. Ivany (born July 22, 1999) is an American professional ice hockey defenseman currently playing for the Pittsburgh Penguins in the National Hockey League (NHL).
St. Ivany was selected by the Philadelphia Flyers in the fourth round, 112th overall, of the 2018 NHL Entry Draft. Unsigned by the Flyers, at the conclusion of his four year collegiate career, St. Ivany was signed to a two-year, entry-level contract with the Pittsburgh Penguins on August 21, 2022.