Ten Hag: Manchester United Appoints New Manager
The Dutchman, 52, will take over from interim boss Ralf Rangnick at the end of this season on a three-year deal which can be extended by a year.
Rangnick, who replaced the sacked Ole Gunnar Solskjaer in November, is set to move into a consultancy role.
Ten Hag will become United's fifth permanent manager since Sir Alex Ferguson retired in 2013.
"It is a great honour to be appointed manager of Manchester United and I am hugely excited by the challenge ahead," said Ten Hag.
"I know the history of this great club and the passion of the fans, and I am absolutely determined to develop a team capable of delivering the success they deserve."