Gartow is a municipality in the district Lüchow-Dannenberg, in Lower Saxony, Germany. It is situated in the easternmost tip of Lower Saxony, not far from the river Elbe, approx. 30km northeast of Salzwedel, and 20km west of Wittenberge. Gartow is also the seat of the Samtgemeinde ("collective municipality") Gartow.