SS Infanta Isabel de Borbon was a steam ocean liner and mail ship launched in 1912 in Scotland and operated by the Compañía Transatlántica Española (CTE). She and her sister ship Reina Victoria-Eugenia represented a significant modernisation of CTE's fleet of ageing and obsolescent ships. After the Second Spanish Republic was declared in 1931 Infanta Isabel de Borbon was renamed Uruguay. In 1932 she was laid up and in 1934 the Republic converted her into a prison ship.