The former Norway international was a fans' favourite during his 11 years at Old Trafford and has now taken to top job at the club.
Here, Press Association Sport looks at the ex-striker's playing and managerial career in pictures.
Ole Gunnar Solskjaer, third left, was among five new signings for Manchester United in July 1996 (Dave Kendall/PA)Solskjaer scored six minutes after coming on as a substitute on his Manchester United debut (Dave Kendall/PA)Solskjaer, right, won the Premier League trophy in his first season with the Red Devils (Owen Humphreys/PA)The Norway international was dismissed for a cyncial foul against Newcastle and received a standing ovation from the Old Trafford crowd in April 1998 (Owen Humphreys/PA)Solskjaer scored four goals in 12 minutes as a second-half substitute against Nottingham Forest in February 1999 (Rui Vieira/PA)The striker scored in the third minute of stoppage-time to win a dramatic Champions League final and seal the treble for Sir Alex Ferguson's side (Owen Humphreys/PA)The striker scored four more in a 5-1 win over Everton in December 1999 (John Giles/PA)Solskjaer celebrating his third Premier League title with Manchester United (Chris Ison/PA)His fourth and fifth Premier League winners' medal came within the next three years (Martin Rickett/PA)After three seasons of knee injuries, Solskjaer returns in 2016 to score the third goal at Charlton (Sean Dempsey/PA)Solskjaer announces his retirement from football on August 27, 2007 and says farewell to Old Trafford (Martin Rickett/PA)The Norweigan becomes Manchester United reserves manager in May 2008 (Martin Rickett/PA)Solskjaer won two league titles and the Norwegian Cup in three years at Molde (Martin Rickett/PA)He became Cardiff manager in January 2014 (PA)Cardiff beat Newcastle in his first game in charge in the FA Cup third round (Owen Humphreys/PA)But just three league wins could not save Cardiff, who suffered relegation from the Premier League. He was sacked in September (Owen Humphreys/PA)Solskjaer returned to Molde and guide the club to the Europa League last 32, beating Celtic twice en route (Danny Lawson/PA)Molde finished second in 2017 and 2018 in Norway's top-flight, defeating Hibernian in this season's Europa League qualifying rounds (Graham Stuart/PA)Solskjaer signed a contract extension until 2021 with Molde on December 3, 2018 (Graham Stuart/PA)
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