Ulmi is a commune located in Giurgiu County, Muntenia, Romania. It is composed of eight villages: Căscioarele, Drăgăneasca, Ghionea, Icoana, Moșteni, Poenari, Trestieni, and Ulmi.

The commune is situated in the Wallachian Plain, on the banks of the river Sabar. It is located in the northern part of the county, on the border with Dâmbovița County.