John Charles Marquez (born 5 June 1970) is a British actor and writer, best known for his role as PC Joseph Penhale in ITV drama series Doc Martin (2007–2022) and Ray Wilson in BBC One's drama In the Club (2014–2016).

This biography of a living person needs additional citations for verification. (July 2016)

• Una vida y dos mandados (1997)
• Jonathan Creek (1997) as Supermarket Manager
• The Trial of Tony Blair (2007)
• Doc Martin (2007–2022)
• Hotel Babylon (2008)
• In the Club (2014—2016)
• Death in Paradise (2017)
• Porridge (2017)
• Britannia (2019)

Marquez was born in Coventry, England. He is the brother of actor Martin Marquez and uncle of Ramona Marquez.