z Rožmberka; 1381 – 7 December 1406) was a nobleman from the Rosenberg family.

[1] Peter was born as the eldest son of Henry III of Rosenberg and his first wife Barbara of Schaunberg.

He got engaged on 14 December 1396 to Anna Landgraves of Leuchtenberg and Countess of Hals.

However, the wedding did not take place because Peter died at the age of 25.

After the death of his father in 1412, Peter's half-brother Oldřich II became the head of the Rosenberg family.