Frederik Michael Ernst Fabritius de Tengnagel (2 January 1781 – 27 May 1849) was a Danish military officer and landscape painter.
He was born at Vejlegård on Funen to the parents Michael Fabritius de Tengnagel and Adolphine née Leth.
Fabritius de Tengnagel initially followed his parents' wishes, enrolling in the Royal Danish Army.
He studied privately with Jens Peter Møller and exhibited his first works in 1820.
In 1723 he went on a short journey to Germany where he visited Johan Christian Dahl with whom he had studied at Møller's art school.