Moosburg an der Isar is a town in the Landkreis Freising of Bavaria, Germany.
The oldest town between Regensburg and Italy, it lies on the river Isar at an altitude of 421 m. It has 18,033 inhabitants and covers an area of 44 km². It is easily reached by the A 92 autobahn and regional trains on the Munich–Regensburg line. Furthermore, it takes just 10 minutes to get to Munich airport.
Moosburg is popular with commuters who travel to Munich, Freising, and Munich airport. There is considerable industry in the town consisting of chemical, electro-technical, food processing, and machine-building plants.