At PSG, she will link up with fellow U.S. international Korbin Albert, while also playing in the same league as U.S. captain Lindsey Horan.
"I'm very happy to be joining Paris Saint-Germain, an ambitious club with an incredible city," Dunn said. "I can't wait to start, meet my teammates and give my best to help the team achieve its goals. I can't wait to start this new adventure!"
For the USWNT, Dunn has made 154 appearances, scoring 25 goals and providing 20 assists. She is a FIFA World Cup winner with the program, as well as a bronze medalist at the 2020 Olympics and a gold medalist at the Paris 2024 Games.
Fellow U.S. internationals Naomi Girma and Jenna Nighswonger also left the NWSL for Europe this January, with Girma signing for Chelsea and the Nighswonger with Arsenal in the WSL.