Oldřich I of Rosenberg (died 4 March 1390) was the fourth son of the Peter I of Rosenberg and his second wife, Kateřina of Vartemberk [cs].

Together with his mother and brothers, he founded a Minorite monastery in Český Krumlov.

Between 1381 and 1382, together with his brothers and Jindřich of Hradec, Oldřich militarily supported Jindřich of Schaunberg in his dispute with Albert III, Duke of Austria.

The dispute was eventually mediated by Czech King Wenceslas IV.

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