Saturnina Rizal Mercado de Hidalgo (1850 – 1913; née Rizal Mercado y Alonso Realonda), or simply Saturnina Hidalgo, was the eldest sister of Philippine national hero José Rizal. She was married to Manuel T. Hidalgo, a native and one of the richest persons in Tanauan, Batangas. She was known as Neneng.