Johann Lederwasch was a painter from the Lederwasch family of painters in Salzburg. He was the son of Gregor Lederwasch IV and brother of Gregor Lederwasch V and Seraphin Lederwasch.

Johann Lederwasch was a pupil of Johann Baptist Hagenauer in Salzburg from 1768 to 1774 and worked in Murau in Upper Styria from 1780, then in Judenburg and other places in Styria in 1809. In 1813 he moved to Graz, where he died completely impoverished.

He was known as the "Styrian Tenier" because of his original costume and genre paintings, painted in a distinctly Dutch style. Johann is particularly important as a church painter, although the quality and originality of his work varies greatly. Of particular importance are his paintings of the Stations of the Cross in Winklern, which are full of Baroque vibrancy, painted with strong contrasts and colors.