Johann Friedrich Schultz also known as Johann Schultz (11 June 1739 in Mühlhausen – 27 June 1805 in Königsberg) was a German Enlightenment, Protestant, theologian, mathematician and philosopher. He is best known as a close personal friend and trusted expositor (a person who explains complicated ideas) of Immanuel Kant. Johann Schultz was a Hofprediger (second court chaplain) and Professor of Mathematics at the University of Königsberg.
Schultz studied theology and mathematics at the Collegium Fridericianum at Königsberg University, where Immanuel Kant lectured, and matriculated on the 24 September 1756. Ludwig Borowski, one of Kant's early biographers stated that Schultz was one the best students of Kant, and this is often repeated in the literature, but Schultz denied ever having attended a lecture.
Schultz initially worked as a private tutor within Königsberg before undertaking employment as a pastor in Starkenberg between 1766 and 1769, taking similar employment at Löwenhagen between 1769 and 1775 before returning in 1775, to Königsberg to work as a Deacon at the Altroßgarten church. On 6 July 1775 he received his magister degree and in 2 August 1775, he took his examination for promotion of habilitation with a disputation on acoustics. He worked as a lecturer over the winter of 1775 and 1776. In 1777, he was made Hofprediger at Königsberg castle church.