Renato Reyes Constantino Sr. (March 10, 1919 – September 15, 1999) was a Filipino historian known for being part of the leftist tradition of Philippine historiography.
He is the father of former Civil Service Commission Chairperson Karina Constantino-David and father-in-law of University of the Philippines Diliman sociology professor emeritus Randy David.
It was also in UP where he co-founded the Alpha Phi Beta fraternity, alongside 17 other students; professor and future Senator Ambrosio Padilla served as their Charter Adviser.
For his academic contributions to the struggle against the Marcos dictatorship, his name is inscribed on the Wall of Remembrance at the Philippines' Bantayog ng mga Bayani (Monument of Heroes).
[1] Today, Constantino is regarded as one of the leading Filipino nationalist historians of the mid-20th century, who advocated for a Filipino-centric view of the country's history, alongside his contemporaries Teodoro Agoncillo and Horacio de la Costa.