Süpplingen is a municipality located in the district of Helmstedt within the state of Lower Saxony, Germany. Situated along the Schunter river, the village lies approximately 6 kilometers west of the town of Helmstedt and is positioned near the Bundesstraße 1.
The municipality is one of the constituent members of the Nord-Elm municipal association. It also includes the former mining settlement of Nordschacht as part of its territory.