Sonia Cubillo Malasarte-Roco (born July 20, 1944) is the widow of Filipino senator and Presidential candidate Raul Roco. She ran for the Senate in the 2007 Philippine Midterm Elections under her late husband's party, Aksyon Demokratiko, which is allied with the broad opposition coalition called Genuine Opposition. She joined the coalition after JV Ejercito, son of deposed President Joseph Estrada, pulled out as an opposition candidate at his father's behest.