Ridolfo Capo Ferro da Cagli (Ridolfo Capoferro, Rodulphus Capoferrus) was a 17th century Italian fencing master. Little is known about the life of this master, though the dedication to Federico Ubaldo della Roevere, the young son of Duke Francesco Maria Feltrio della Roevere, may indicate that he was associated with the court at Urbino in some capacity. At the age of 52, Capo Ferro authored a treatise on the rapier entitled Gran Simulacro dell'Arte e dell'Uso della Scherma ("Great Representation of the Art and Use of Fencing"); it was published in Siena in 1610, but refers to Federico by the ducal title. Though this treatise is highly praised by modern fencing historians, it is neither comprehensive nor particularly innovative and does not seem to have been influential in its own time.