The 27-year-old has signed for Arsenal in a deal worth €80,000, with €20,000 in potential bonuses. The former WSL top scorer is with Team GB for Tokyo 2020 and will link up with the north London side for preseason later this summer.
Parris returns to the WSL after two seasons in France where she won the UEFA Women's Champions League, Coupe de France Feminine, Trophee des Championnes, and the Women's International Champions Cup.
"I'm very happy to be here in north London playing for Arsenal," Parris said in a statement. "It's a great team with an unbelievable history. Hopefully we can make more successful years to come.
"I want to achieve all domestic titles and compete in the Champions League here. I'm happy to be back in the WSL which has grown and improved so much since I left.
"I think the most important thing was making sure that I chose the best club and the best place for me to really push on my career. Here at Arsenal, after talking with Clare [Wheatley] and the staff, it became apparent that it was here. Hopefully we can make more success here at Arsenal."