Johann Georg Weishaupt (24 April 1717 – 20 September 1753) was a professor of law at the University of Ingolstadt.

Weishaupt was born in Brilon in the Prussian government district of Arnsberg in Westphalia.^[1] He studied law in the University of Würzburg under Johann Adam von Ickstatt (1702–1776). He received a doctorate in law in 1743 and began to teach at the university. His dissertation was on Dissertatio Juris Publici Universalis De Summo Imperio Atque Inde Descendente Jure, Obligatione, & Potestate.^[2]

Johann Adam von Ickstatt became a professor of law at the University of Ingolstadt in 1746. Weishaupt also moved from Würzburg to the University of Ingolstadt.^[3] Ickstatt had him appointed professor of imperial institutions and criminal law by decree of 14 October 1746.^[1] He held this position until his death. One of his pupils was the future historian Johann Georg von Lori, who wrote a doctorate in the University of Ingolstadt in 1748.^[4]

Weishaupt died suddenly while on holiday on 20 September 1753 in Heiligenthal near Würzburg. Weishaupt's son, Johann Adam Weishaupt, was born on 6 February 1748 in Ingolstadt, and was just five years old when his father died. Johann Adam von Ickstatt, also a professor of law at the University of Ingolstadt and Adam's godfather, took over Adam Weishaupt's upbringing.^[1]