The Steyr 90 series is a cab over truck originally introduced in 1968, built by Steyr-Daimler-Puch AG in Steyr, Austria. It has a tilting cab and is of a distinct shape, which survived into the twenty-first century with China's Sinotruk. In 1978 the facelifted Steyr 91 replaced the 90, and it was in turn replaced by the redesigned Steyr 92 in 1986. Considering its comparatively low production numbers an unusually wide range of models and configurations were available, necessitated by Steyr's dominance of the Austrian truck market in the period - in 1980 about 35% of trucks on the roads there were made by Steyr. It was known as Steyr 800 in Japan.

Steyr-Daimler-Puch was a large manufacturing conglomerate based in Steyr, Austria, which was broken up in stages between 1987 and 2001. The component parts and operations continued to exist under separate ownership and new names.