Rethem (German: [ˈʁeːtəm] ⓘ) is a town in the Heidekreis in Lower Saxony, Germany.

It is situated on the river Aller, approx.

The town was the scene of heavy fighting over the period 10–11 April 1945 between units of the British 53rd Welsh Division and parts of the German 2.

Rethem is the seat of the Samtgemeinde ("collective municipality") Rethem/Aller.

[1] This Heidekreis location article is a stub.