Georg Richard Lewin (19 April 1820 – 1 November 1896) was a German dermatologist, known for his research into syphilis and various skin diseases.

Lewin was born in Sondershausen in the principality of Schwarzburg-Sondershausen (modern-day Thuringia), attending Gymnasium there and later in Magdeburg and Mühlhausen.

After a postgraduate course at the universities of Vienna, Würzburg, and Paris he settled in Berlin, where he practised as a specialist first in otology, and later in dermatology and syphilis.

In 1865 he became chief physician in the Syphilis and Skin Diseases Department at the Charité hospital in Berlin, replacing Felix von Bärensprung.

This action of the government aroused much indignation in the medical faculties of most of the universities of Germany, and much public sympathy was expressed for Lewin.