Odgar, Frankish archbishop of Mainz

Otgar, Otger or Odgar is a Germanic masculine given name. It may refer to:

• Saint Otger, missionary
• Autchar, Frankish nobleman
• Otgar of Mainz, archbishop (826–847)
• Otgar, bishop of Eichstätt (847–880)
• Hoger, abbot and music theorist
• Otgar, founding abbot of Saint-Pons-de-Thomières (937–940)
• Otgar, bishop of Speyer (962–970)
• Otger of Girona, Catalan count (c.862–c.872)
• Otger Cataló, figure of Catalan legend

Mainz is the capital and largest city of the German state of Rhineland-Palatinate, and with around 223,000 inhabitants, it is Germany's 35th-largest city. It lies in the Rhine-Main Metropolitan Region—Germany's second-largest metropolitan region after Rhine-Ruhr—which also encompasses the cities of Frankfurt am Main, Wiesbaden, Darmstadt, Offenbach am Main, and Hanau.