Friedrich Joachim Michael Stengel (29 September 1694 – 10 January 1787) was a German architect and baumeister.

[1] He received his education from the Prussian Academy of Arts where he studied fortification engineering, civil architecture, artillery, and geometry.

While carrying out a "general state renovation" in Saxe-Eisenach, he met Adolphus von Dalberg which led to his employment in Fulda.

Together with William Henry, Stengel renovated and expanded Saarbrücken as a Baroque residential city, and worked as chief building director in many of the towns that belonged to Nassau-Saarbrücken.

He also served as the President of the Forest Chamber and director of the Saarbrücken orphanage, poorhouse, and penitentiary, before retiring in 1775.

One year later, Stengel married Klara Storch, first maid of Princess Charlotte Amalie of Nassau-Dillenburg.