Johann I
Johann I may refer to:
- Johann I Josef, Prince of Liechtenstein
- Johann I, Duke of Opava-Ratibor
- Johann I, Count Palatine of Simmern
- Johann I, Count Palatine of Zweibrücken
- John, Elector of Saxony, John the Steadfast
- Johann, Count of Cleves
- Johann, Count of Coronini-Cronberg
- Johann, Count of Pálffy
- Johann, Count von Aldringer
- Johann, Count von Werth
- Johann, Elector of Brandenburg
- Johann Strauss I
- Johann, Baron von Appel
- Johann I, Count of Habsburg-Laufenburg-Rapperswil
- Johann Adolf I, Duke of Saxe-Weissenfels