Rioz is a commune in the Haute-Saône department in the region of Bourgogne-Franche-Comté in eastern France. Like in many regional …Rioz is a commune in the Haute-Saône department in the region of Bourgogne-Franche-Comté in eastern France. Like in many regional toponyms, the "z" is silent in "Rioz". In 1973 it absorbed the former commune Les Fontenis.