Salm-Horstmar was a short-lived Napoleonic County in far northern North Rhine-Westphalia, Germany, located around Horstmar, to the northeast of Münster.

It was created in 1803 for Wild- and Rhinegrave Wilhelm Frederick Charles Augustus of Salm-Grumbach (1799-1865), member of an ancient German House of Salm, following the loss of Grumbach and other territories west of the Rhine to France.

The county was mediatised to the Kingdom of Prussia in 1813 and the Wild- and Rhinegrave was awarded a princely title within the Kingdom of Prussia three years later, on 22 November 1816 by Frederick William III of Prussia.

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