In it they thank him for his work during his time in charge and wish him success
Poor performances in the league - United are 19-points off top spot - and growing discontent with fans and players meant the club had to act.
The club revealed the news in stark 66-word statement.
Man Utd's statement to sack Mourinho in full
Manchester United announces that manager Jose Mourinho has left the club with immediate effect.
The club would like to thank Jose for his work during his time at Manchester United and to wish him success in the future.
A new caretaker manager will be appointed until the end of the current season, while the club conducts a thorough recruitment process for a new, full-time manage.
Three years ago yesterday, Jose Mourinho was sacked by Chelsea, but Chelsea showed appreciation towards the Portugese with a much longer statement...
Chelsea statement to sack Mourinho
Chelsea Football Club and Jose Mourinho have today parted company by mutual consent.
All at Chelsea thank Jose for his immense contribution since he returned as manager in the summer of 2013.
His three league titles, FA Cup, Community Shield and three League Cup wins over two spells make him the most successful manager in our 110-year history. But both Jose and the board agreed results have not been good enough this season and believe it is in the best interests of both parties to go our separate ways.
The club wishes to make clear Jose leaves us on good terms and will always remain a much-loved, respected and significant figure at Chelsea. His legacy at Stamford Bridge and in England has long been guaranteed and he will always be warmly welcomed back to Stamford Bridge.
The club’s focus is now on ensuring our talented squad reaches its potential.
There will be no further comment until a new appointment is made.