Otto Rehhagel, German footballer, coach, and manager
Otto Rehhagel (German: [ˈɔtoː ˈʁeːhaːɡl̩]; born 9 August 1938) is a German former football coach and player.

Rehagel is one of only two people who, as player and manager combined, has participated in over 1,000 Bundesliga matches (the other being Jupp Heynckes). In the Bundesliga, he holds the records for the most victories (387), most draws (205), most losses (228), and his teams have scored the most goals (1,473) and conceded more (1,142) than any other. He served as the trainer of Werder Bremen between 1981 and 1995 and won twice the Bundesliga and in 1992 the UEFA Cup Winners' Cup with them. After a rather unsuccessful intermezzo at Bayern Munich, he won the Bundesliga sensationally with the promoted team 1. FC Kaiserslautern.

Internationally, Rehhagel coached the Greece national team from 2001 to 2010 in the nation's most successful footballing era – during that period, the Greek team won the 2004 European Championship unexpectedly and qualified for the 2010 World Cup, their second World Cup finals participation. A 2021 documentary titled King Otto, was about the 2004 feat.