De Mars is a hamlet in the Dutch province of Gelderland.

It is a part of the municipality of Buren, and lies about 8 km south of Veenendaal.

The area belonging to De Mars was originally located north of the Rhine river.

However, the river bed now runs along a new route north of De Mars.

It was first mentioned in 1250 as in Marsche, and means "in the marsh".