Zmajevac (Hungarian: Vörösmart; Serbian Cyrillic: Змајевац; Latin: Ad Novas)[4] is a settlement in the region of Baranja, Croatia.

Administratively, it is located in the Kneževi Vinogradi municipality within the Osijek-Baranja County.

Zmajevac was founded on the foundations of the Roman colony Ad Novas.

[6] Zmajevac is approximately 36 km north of Osijek and 22 km south of the border with Hungary.

Serbia is approximately 8 kilometers away.