As a surname, Pia or Pius, may refer to:
Frank Pia, lifeguard who invented the Pia carry Pascal Pia (1903-1979), French writer, journalist, illustrator and scholar born Pierre Durand Secondo Pia (1855–1941), Italian lawyer and amateur photographer best known for taking the first photographs of the Shroud of Turin Ulla Pia (born 1945), Danish singer