Sadu (; ) is a commune in Sibiu County, Transylvania, Romania, at the foothills of the Cindrel Mountains, 27 km south of the county capital Sibiu, in the Mărginimea Sibiului ethnographic area. It is composed of a single village, Sadu.

In 1910 the village had 2,143 inhabitants. At the 2021 census, Sadu had a population of 2,561, of which 91.25% were Romanians.

Natives The most notable people born in Sadu are: Inocențiu Micu-Klein (1692 – 1768), Romanian Greek-Catholic Bishop Samuil Micu-Klein (1745 – 1806), theologist, historian, philosopher, member of Transylvanian School

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