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- Mark Organ
- Mark O'Shea
- Marko Stunt
- Mark O'Sullivan
- Mark Palmer
- Mark Papermaster
- Mark Paul
- Mark-Paul Gosselaar
- Mark Pellegrino
- Mark Penn
- Mark Pentecost
- Mark Pesce
- Mark Peter Davis
- Mark Pimentel
- Mark Pincus
- Mark Plotkin
- Mark Radcliffe
- Mark Ralph
- Mark Ramadan
- Mark Ramsey
- Mark Rank
- Mark Rasch
- Mark Rasta
- Mark Ravenhill
- Mark Read
- Mark Regan
- Mark Rennie
- Mark Richard
- Mark Riedl
- Mark Risinger
- Mark Rober
- Mark Roberge
- Mark Roberts
- Mark Roesler
- Mark Romanek
- Mark Ronson
- Mark Rosekind
- Mark Rossini
- Mark Rowe
- Mark Rowland
- Mark Rowlands
- Mark Rozzo
- Mark Ruffalo
- Mark Ryan
- Mark Rylance
- Mark Salter
- Mark Saroufim
- Mark Schaller
- Mark Schatzker
- Mark Seliger
- Mark Sellke
- Mark Serritella
- Mark Shapiro
- Mark Sheppard
- Mark Sheskin
- Mark Shriver
- Mark Siddall
- Mark Silcox
- Mark Siljander
- Mark Simmons