The Radical Party was a Chilean political party. It was formed in 1863 in Copiapó by a split in the Liberal Party. Not coincidentally, it was formed shortly after the organization of the Grand Lodge of Chile, and has maintained a close relationship with Chilean Freemasonry throughout its life. As such, it represented the anticlericalist position in Chilean politics, and was instrumental in producing the "theological reforms" in Chilean law in the early 1880s.