Lambert previously served on the staff of Capitals coach Barry Trotz when he was with the Nashville Predators. The Predators earlier in the day announced they had given the Capitals permission to talk to Lambert.
"Recognizing that it is a great opportunity for his career, we have given the Washington Capitals permission to speak to Lane Lambert about joining their coaching staff," Predators general manager David Poile said in a statement. "We appreciate all of Lane's contributions to our organization, from his time helping the development of our prospects and leading the Milwaukee Admirals to six consecutive playoff berths from 2006-11, to this three seasons in Nashville from 2011-14. We wish him and his family all the best as they move onto the next chapter in their lives."
Lambert joins Trotz, who was named coach of the Capitals on May 26, and former Predators goaltending coach Mitch Korn, who took that position with the Capitals on Tuesday.