Carl von Voit (31 October 1831 – 31 January 1908) was a German physiologist and dietitian.

In 1855 he furthered his education at the University of Göttingen under chemist Friedrich Wohler, and in 1856/57 served as an assistant to Theodor von Bischoff in Munich.

As a chemist and physiologist, he found that the amount of nitrogen in excreted urea is a measure for the protein turnover.

He was also a successful teacher, attracting international students to the University of Munich and thus significantly influencing the US nutritionist, among others.

[2] His grand daughter via Emilie was Elsbeth Steinheil, the first German woman to graduate in mechanical engineering, qualifying in 1917 from the Technical University of Munich.