Playing career
Dunne played collegiate hockey for the Clarkson Golden Knights in the NCAA. He signed as an undrafted free agent with the Columbus Blue Jackets on March 14, 2021.
In the 2020–21 season, Dunne joined the Blue Jackets' AHL affiliate, making his professional debut with the Cleveland Monsters. After 7 games with the Monsters, Dunne was recalled by Columbus and made his NHL debut in a 4–1 defeat against the Dallas Stars on April 15, 2021.
After four seasons with the Blue Jackets, Dunne left the club as a free agent and was signed to a two-year, two-way contract with the Buffalo Sabres on July 1, 2024.
At the conclusion of his contract with the Sabres, Dunne was signed to a one-year, $850,000 contract with the Washington Capitals for the 2026–27 season on July 1, 2026.
Personal life
Dunne has five siblings all of whom have played college hockey at some level. He was the first in his family to play hockey, he began playing inline hockey at age five after he first started watching hockey. His elder sister Jincy, currently plays for the Minnesota Frost. His younger sister Joy currently plays for Ohio State, as did his older sister Jessica previously. His younger brother James plays ACHA level hockey at Oklahoma State and his younger sister Josey played two seasons at Lindenwood University after playing three years at University of Minnesota.
During the 2026 Winter Olympics in Milan-Cortina Josh attended to support both his younger sister Joy, on Team USA, as well as his girlfriend, Ella Shelton, who plays for Team Canada as well as the Toronto Sceptres in the PWHL. The two faced off against one another in the gold medal game. Josh and Ella became engaged in July 2026.
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