Charlie O. Cojuangco is the former fourth district Representative of Negros Occidental in the Philippines. He is also one of the sons of Eduardo Cojuangco, Jr., brother of Mark Cojuangco Representative of 5th District of Pangasinan.
He is married to Rio Diaz-Cojuangco was a former beauty queen, She was the sister of former Miss Universe Gloria Diaz. Rio was diagnosed with Stage 4 colon cancer in December 1998. She was given three months to live then, but she lived for six more years. She died on October 4, 2004 in Seton Hospital in Daly City, California at the age of only 45.