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 (1381 ft). It has 17,275 inhabitants (2005) 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 just takes 10 minutes to get to the Munich airport.
Moosburg is popular with commuters to Munich, Freising, and the Munich airport. There is considerable industry in the town - with chemical, electrotechnical, food processing, and machine-building plants.