Jost Trier (15 December 1894 in Schlitz, Hesse – 15 September 1970 in Bad Salzuflen) was a German Germanic linguist and Medievalist.
Since 1932, Jost Trier taught as a professor at Münster University where he developed the lexical field theory.
From 1933, Trier was a member of the Nazi party (NSDAP).
He viewed German philology in the terms of Nazi ideology ("Volkskörper", "Volksgemeinschaft").
This, however, proved no obstacle to a post-war career in Western Germany.
In 1968 Trier was awarded the prestigious Konrad-Duden-Preis.