David Moyes, the 61-year-old Scot has again signed a two-and-a-half-year contract at Goodison Park following the sacking of Sean Dyche on Thursday.
Moyes said, "I enjoyed 11 wonderful and successful years at Everton and didn't hesitate when I was offered the opportunity to rejoin this great club".
Moyes managed Everton from 2002 until 2013 before spells in charge of Manchester United, Real Sociedad, Sunderland and West Ham twice.
He was sacked in April 2014 after 10 months in charge, with United seventh in the table and unable to qualify for the Champions League.
Moyes had a year in La Liga with Sociedad before returning to English football with Sunderland, who were relegated from the Premier League in 2016-17.
Moyes arrived West Ham the month following the sacking of Manuel Pellegrini, and remained in charge until the end of the 2023-24 season.
Within this period, he has led them to two top-seven finishes and won the Europa Conference League, their first major trophy for 43 years.