Starnberg (German pronunciation: [ˈʃtaʁnbɛʁk]) is a Landkreis (district) in the southern part of Bavaria, Germany.

Neighboring districts are (from the north clockwise) Fürstenfeldbruck, Munich, Bad Tölz-Wolfratshausen, Weilheim-Schongau and Landsberg.

The main geographic feature of the district are the five lakes – the Starnberger See and Ammersee, as well as the smaller Weßlinger See, Wörthsee and Pilsensee.

In the 1978 communal reform the previously 42 municipalities were merged into the current 14 ones.

The coat of arms show the Bavarian diamonds in the background, with a yellow lion and eagle in front.