Zeilarn is a municipality in the district of Rottal-Inn in Bavaria, Germany.

Zeilarn is located in the region Landshut in a characteristic Lower Bavarian landscape of hills directly along the B20 about 14 km southeast of Eggenfelden, 18 km northeast of Altötting, 20 km north of Burghausen, 17 km northwest of Simbach and 20 km southwest of the county town Pfarrkirchen. The nearest train station is situated in Marktl.