Fabritius de Tengnagel is a Danish and Norwegian noble family.
The family originated from Johannes Fabritius (1620-71) of Brandenburg. The genus immigrated to Denmark with his son Herman Fabritius (1667-1729). Conrad Alexander Fabritius (1731–1805) and Michael Fabritius (1739–1815), as well as all legitimate children of their then-deceased father Michael Fabritius (1697-1746), were on 4 September 1778 ennobled under the name Fabritius de Tengnagel.