Duvalier is a surname, and may refer to:

• François Duvalier (1907–1971), nicknamed "Papa Doc", President of Haiti 1957–71
• Jean-Claude Duvalier (1951–2014), nicknamed "Baby Doc", son of François Duvalier and President of Haiti 1971–86
• Simone Ovid Duvalier (1913–1997), nicknamed "Mama Doc", widow of François Duvalier and mother of Jean-Claude Duvalier
• Michèle Bennett Duvalier (b. 1950), former wife of Jean-Claude Duvalier 1980–90

• Mark Quigley
• Mark Radford (basketball)
• Mark Rakita
• Mark Rambo
• Mark Ramos-Nishita
• Mark Randall
• Mark Randall (basketball)
• Mark Randall (disambiguation)
• Mark Randall (footballer)
• Mark Rankine
• Mark Rankin (vocalist)
• Markranstadt
• Markranstaedt
• Markranstädt
• Mark Raper
• Mark Rashid
• Mark Rasmussen
• Mark Rathbun
• Mark Ravenhill
• Mark Ravina
• Mark Ravin Ramprakash
• Mark Rawle
• Mark Raymond Bonham Carter
• Mark Raymond Bonham-Carter
• Mark Raymond Bonham-Carter, Baron Bonham-Carter