Stefan Lorenz Radt (4 August 1927 − 22 November 2017) was a German-born Dutch historian of Jewish descent, author and academic who works in ancient Greek geography. He was born in Berlin, but was raised in The Hague. He was known for his books Tragicorum Graecorum Fragmenta, Strabons Geographika, and The Importance Of The Context.
He fled to the Netherlands in 1937.
Radt died in The Hague on 22 November 2017 at the age of 90.