Martin Truchseß von Wetzhausen zu Dachsbach (c. 1435 – 3 January 1489) was the 34th Grand Master of the Teutonic Knights, serving from 1477 to 1489.

Von Wetzhausen hailed from a family of Imperial Knights, later barons from the Würzburg area in Franconia.

On 4 August 1477 the Order's Capitulum elected him Grand Master, despite his having once pledged that "ehe er welde dem Könige von Polen schweren, er welde ehe in seinem Blutte vortrincken" (archaic German: "Before he would swear homage to the King of Poland, he would sooner drown in his own blood") — which the Grand Masters had been obliged to do since the Second Peace of Thorn (1466).

The Polish army under the command of Jan Biały and Jan Zieleziński, supported by Royal Prussia and Danzig, defeated the Order's army quickly and the Grand Master had to paid the homage to the Polish king on 9 October 1479 in Nowe Miasto Korczyn.

Afterwards, von Wetzhausen focused on internal policy within the Order and its problematic financial situation.