Michaels, following in Paula Abdul's footsteps, first tweeted the news of her departure Wednesday night. She wrote that she had "five wonderful years to create moments and movement for the world to share with me."
Michaels, who won an Emmy in 2007 for her choreography on the show, has been on Dance since its 2005 debut. She served as both a contributing choreographer and an occasional judge.
Executive producer and judge Nigel Lythgoe released a statement Thursday praising Michaels' contributions to the show.
"We are thrilled to have given a talent such as Mia Michaels a platform to create Emmy Award-winning choreography," Lythgoe said. "During the auditions this season she has helped choose the best, most diverse top 20 we have ever had. She knows that she is always welcome to return later this season or next."