Gilio Bisagno (born January 31, 1902, date of death unknown) was an Italian freestyle swimmer who competed in the 1920 Summer Olympics.
He was born in Sampierdarena.
In 1920 he was a member of the Italian relay team which finished fifth in the 4 x 200 metre freestyle relay competition. He also participated in the 400 metre freestyle event and in the 1500 metre freestyle competition but in both he was eliminated in the first round.