Östrum is a village in the southern part of the town of Bad Salzdetfurth in Lower Saxony, Germany.

The L 490 state road runs through the village crossing with the L493.

Its immediate neighbours are the villages of Breinum to the west and Bodenburg to the south.

As part of the administrative reform in 1974 Östrum became one of the 13 parishes in the borough of Bad Salzdetfurth.

As of 2022, the parish chair is Thomas Andreas (SPD).