Sebastiano Montelupi (Polish: Sebastian Montelupi, name occasionally Polonized as Wilczogórski, 1516 – 18 August 1600),[1] was an Italian-born merchant and banker in Kraków, Poland, and Postmaster General of the Polish royal postal service under Sigismund II Augustus, Henry III of Poland, Anna Jagiellon, Stephen Báthory and Sigismund III Vasa.

[2] From 1568 Montelupi was the postmaster general of the Polish Royal Post (succeeding Pietro Maffon), running one public service to Vilnius (in three weeks) and another to Vienna and Venice (in ten days).

In 1583 he was confirmed as the royal postmaster general by the new king, Stephen Báthory, on condition he maintain public deliveries between the major cities of the Polish–Lithuanian Commonwealth, and an international service to and from Venice at least twice each month.

His position enabled Montelupi to provide high-level information services for correspondents including the Medici in Florence and the Fugger in Augsburg.

[11] In 2008 a commemorative stamp set celebrating the 450th anniversary of the Polish postal service was issued, featuring portraits of Prosper Provano and Sebastiano Montelupi.