Petrovac (Montenegrin Cyrillic:Петровац, (pronounced ; or Petrovac na Moru (trans. Petrovac on Sea; Montenegrin Cyrillic: Петровац на Мору; Italian: Castellastua)) is a coastal town in Montenegro, within Budva Municipality.
Petrovac is located on the coast between Budva and Bar, where the old mountain road from Podgorica reaches the coast. It has a 600 m long sandy beach and it is a popular tourist destination. Petrovac is seen as a somewhat "calmer" resort, in contrast to the lively and developed nearby towns of Budva and Sutomore.