Tuntenhausen is a municipality in the district of Rosenheim in Bavaria in Germany.
There are 57 official districts of Tuntenhausen, namely Tuntenhausen itself, Antersberg, Aubenhausen, Bach, Berg, Beyharting, Biberg, Bichl, Bichl, Bolkam, Brettschleipfen, Dettendorf, Eggarten, Eisenbartling, Emling, Fischbach, Fuchsholz, Großrain, Guperding, Haus, Höglhaus, Hohenthann, Holzbichl, Hopfen, Hörmating, Innerthann, Jakobsberg, Karlsried, Knogl, Kronbichl, Lampferding, Mailling, Maxlrain, Moosmühle, Mühlholz, Neureith, Nordhof, Oberrain, Oed, Ostermünchen, Pangraz, Schlafthal, Schmidhausen, Schönau, Schwaig, Schweizerberg, Schweizerting, Seisrain, Sindlhausen, Söhl, Stetten, Stetten, Thal, Unterrain, Voglried, Weiching, Weng.
Ostermünchen is a station of the Munich–Rosenheim railway and served about once per hour by local trains.
The town is known best for its church, a destination for Roman Catholic pilgrims in Bavaria.