Arco can refer to:*ARCO, the Atlantic Richfield Company, an American petroleum company Music Arco, a directive in music for string instruments to indicate that the hair of the bow should be used to play in the normal way (following a passage played pizzicato, for example) ARCO, a professional diploma for church organists by the Royal College of Organists Places Arco, Italy, a town that's a popular rock climbing destination Arco, Idaho, in the United States Arco, Minnesota, a city in the Un… (More on Arco)