- Mark Schuman -- Mark Seidman
- Mark Selby -- Mark Seymour and the Undertow
- Mark Sganga -- Mark Sheridan
- Mark Sherman -- Mark Shreeve
- Mark Shurilla & The Blackholes -- Mark Smart
- Mark Smeby -- Mark Solotroff
- Mark Sonksen -- Mark Spice
- Mark 'Spike' Stent Mix -- Mark St. John Carson
- Mark St. Juste -- Mark Stepakoff
- Mark Stephen -- Mark Stevens
- Mark Stewart -- Mark Strano
- Mark Strozier -- Mark Suozzo
- Mark & Susan Farah -- Mark Swift