D'addario or Daddario is a surname and may refer to:
Alessandro D'Addario (born 1997), Sammarinese soccer-player Brian and Michael D'Addario, American musicians in The Lemon Twigs Emilio Q. Daddario (1918–2010), American politician, father of Richard, grandfather of Alexandra Alexandra Daddario (born 1986), American actress and model Matthew Daddario (born 1987), American actor, brother of Alexandra Gary D'Addario, American retired police commander, television technical advisor, and actor Lorenzo D'Addario (born 1964), Italian general Ray D'Addario (1920–2011), American photographer D'Addario, a manufacturer of musical instrument strings and accessories D'Addario Industries, a business group in Connecticut
See also Addario