Martin Schäuble is a German novelist, journalist and writer of non-fiction books. His pen name is Robert M. Sonntag. His works have been translated into several languages.

Martin Schneider, often just called "Maddin", is a German comedian, cabaret artist and actor.

Martin Roger Seymour-Smith was a British poet, literary critic, and biographer.

Martin Shapiro is an American screenwriter and comic book writer. He created the horror comic book series Chopper published by Asylum Press and wrote the screenplay for the movie version of it.

Martin Andrew Sharp Hume, born Martin Andrew Sharp, was an English historian, long a resident in Spain.

Martin Gerald Sherman is an American dramatist and screenwriter best known for his 20 stage plays which have been produced in over 60 countries. He rose to fame in 1979 with the production of his play Bent, which explores the persecution of homosexuals during the Holocaust. Bent was a Tony nominee for Best Play in 1980 and won the Dramatists Guild's Hull-Warriner Award. It was adapted by Sherman for a major motion picture in 1997 and later by independent sources as a ballet in Brazil. Sherman is Jewish and openly gay, and many of his works dramatize "outsiders," dealing with the discrimination and marginalization of minorities whether "gay, female, foreign, disabled, different in religion, class or color." He has lived and worked in London since 1980.

Martin Shubik (1926-2018) was an American mathematical economist who specialized in game theory, defense analysis, and the theory of money and financial institutions. The latter was his main research interest and he coined the term "mathematical institutional economics" in 1959 to describe it and referred to it as his "white whale". He spent the majority of his career at Yale University, where he was heavily involved with the Cowles Foundation for Research in Economics, and launched the virtual Museum of Money and Financial Institutions.

Martin Sixsmith is a British author and radio/television presenter, primarily working for the BBC. He has also worked as an adviser to the Labour government and to the BBC television comedy series The Thick of It. Sixsmith's book, The Lost Child of Philomena Lee, was the basis for the 2013 film Philomena, in which Sixsmith is played by Steve Coogan.

George Martin Stephen was High Master (headmaster) of St Paul's School in London until 1 January 2011. He is an author and has been described as "one of Britain's highest profile heads".

Martin Suter is a Swiss author. He became known for his weekly column Business Class in the Weltwoche newspaper (1992–2004), now appearing in the Tages-Anzeiger, and another column appearing in "NZZ Folio". The columns have been published as nine books.