Deißlingen is physically located in a transitional landscape between the muschelkalk-keuper plateaus of the Upper Gäu [de] to the north, the Swabian Jura to the east, and the Baar to the south.

Elevation above sea level in the municipal area ranges from a high of 753 meters (2,470 ft) Normalnull (NN) at the border with Tuttlingen district to a low of 574 meters (1,883 ft) NN on the Neckar as it forms the border with Rottweil.

[2] The forested slopes of the Neckar and Mückenbach river valleys were declared Federally-protected landscapes [de] in 1953.

This coat of arms is a combination of those of the towns of Deißlingen and Lauffen, with a change made to the chief to comply with the rule of tincture.

The Rottweil district office approved the official use of the coat of arms and issued a corresponding municipal flag on 10 December 1981.