Stefan Stenudd is one of the most prominent aikido teachers in Sweden, and also active as writer, astrologist and freelance journalist. He holds 7th dan and is a Shihan in the aikido organisation Aikikai, a rank he acquired in 2003, and 4th dan in Shoji Nishios own iaido system, aikido toho.

Stefan Szolc-Rogoziński was a Polish explorer of Africa. He was planning to create a Polish colony in Cameroon.

Stefan Themerson was a Polish writer of children's literature, poet and inventor of Semantic Poetry, novelist, script writer filmmaker, composer and philosopher. He wrote in at least three languages. With his wife, Franciszka Themerson, they are regarded as leading husband-and-wife exponents of European Surrealism and publishers.

Stefan Nedelchev Tsanev is a contemporary Bulgarian writer, known for his essays, plays, poems, and historical novels.

Stefan Voigt is a German economist and one of the Directors of the University of Hamburg's Institute of Law and Economics. He is also a Fellow of CESifo in Munich.

Stefan Winter is a German ski mountaineer, former coach of the German ski mountaineering team, and alpine sports author.

Stefan Wolle is a German historian. A focus of his socio-historical research is on the German Democratic Republic which is where, before reunification, he lived and worked.

Stefan Wul was the nom de plume of the French science fiction writer Pierre Pairault, born in Paris.

Stefan Yavorsky, born Simeon Ivanovich Yavorsky, was an archbishop and statesman in the Russian Empire and the first president of the Most Holy Synod.

Stefan Żeromski was a Polish novelist and dramatist belonging to the Young Poland movement at the turn of the 20th century. He was called the "conscience of Polish literature".