Lettelbert (Dutch pronunciation: [ˈlɛtəlˌbɛrt]; Gronings: Lepterd) is a village in the municipality of Westerkwartier in the province of Groningen in the Netherlands.

The village arose in the Middle Ages on a sand ridge in the Westerkwartier near the Lettelberterdiep [nl].

The Reformed church of Lettelbert is owned by the Stichting Oude Groninger Kerken.

The single-aisled church was built in the thirteenth century and has a five-sided closed choir and a roof turret.

Near the village are the Lettelberterpetten, a peat area that was extracted between 1900 and 1920 and became overgrown with alder woods and has been a nature reserve of Het Groninger Landschap since 1961.