The 36 year-old midfield ace turned down offers from across Europe and around the world to sign for the MLS expansion franchise.
Lampard will be working under New York City FC Head Coach Jason Kreis, who has been busy looking for players as the Club aims to build a competitive squad.
"I am really looking forward to working with Frank," he said. "His leadership, maturity and experience are perfect characteristics for a new Club like ours.
"He is a rare talent, one that scores a lot of goals from midfield, yet is also a disciplined defender and someone who reads the game brilliantly. A gift for a coach.
"Frank has a tremendous appetite for the game and that will be an enormous help not only to me and the coaching staff but also the rest of the players, particularly the younger ones who can look up to Frank and attempt to emulate his achievements.
"He has just come from the World Cup and still very much at the top of his game. His desire and work ethic will be infectious."
Those words were echoed by NYCFC's Sporting Director Claudio Reyna, himself a former midfield player in the English Premier League.
He added: "I am delighted Frank has joined us, he was an obvious choice. I have played against him many times and can vouch for his quality. Frank is one of the best midfielders to have played the modern game, a legend in England and hopefully he will become one here, too."
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