Piros or Piroš is a surname. Notable people with the surname include:

• Andrea Piros (born 1966), Swiss fencer
• Kamil Piroš (born 1978), Czech ice hockey player
• László Piros (1917–2006), Hungarian politician and military officer
• Zsombor Piros (born 1999), Hungarian tennis player
• Piros (born 1989), Serbian graffiti and mural artist

• St. John's University (China)
• St. John's University (Italy)
• St. John's University (Minnesota)
• St. John's University, New York
• St. John's University School of Law
• St. John's University School of Medicine
• St. John's University, Shanghai
• St. John's University (Shanghai)
• St. John's University strike of 1966–67
• St.Johnsville
• St. Johnsville
• St. Johns Water Management District
• St John's, Woking
• St. John's Wood Clique
• St John's Wood Clique
• St johns woodlawn
• St Johns Wood, Queensland
• St John's wood tube
• St.-John's-wort
• St. Johnswort
• St. John's wort
• St. John's-wort family
• St. John's-worts
• St. John the Baptist Byzantine Catholic Cathedral (Pittsburgh)
• St. John the Baptist Byzantine Catholic Cemetery