Oud Ootmarsum is a hamlet in the Dutch province of Overijssel.

It is a part of the municipality of Dinkelland, and lies about 12 km north of Oldenzaal and very close to Ootmarsum.

Oud Ootmarsum is a statistical entity and has its own postal code,[1][3] however it is considered a hamlet.

[4] The hamlet is the predecessor of the city of Ootmarsum, and was first mentioned in 1384 as Olde Oetmarsum.

[4] The partially timber-framed building style of barns and farmhouses here is closely related to the building style of the Low German house.