Oscar Ruffini (1858–1957) was an architect in San Angelo, Texas.
He worked some with architect brother Frederick Ernst Ruffini.
A number of his works are listed on the U.S. National Register of Historic Places.
Works include (with attribution):
Concho County Courthouse, Public Sq. Paint Rock, TX Ruffini, F.E. and Ruffini, OscarCrockett County Courthouse, 907 Ave. D Ozona, TX Ruffini, OscarHarris Drug Store, 114 S. Chadbourne St. San Angelo, TX Ruffini, OscarMason-Hughes House, 1104 W. Beauregard San Angelo, TX Ruffini, OscarMontgomery Ward Building, 10 W. Beauregard San Angelo, TX Ruffini, OscarJ. J. Rackley Building, 118 S. Chadbourne San Angelo, TX Ruffini, OscarSan Angelo National Bank, Johnson and Taylor, and Schwartz and Raas Buildings, 20–22, 24, 26 E. Concho Ave. San Angelo, TX Lillis, Ruffini & RuffiniSutton County Courthouse, Public Sq. Sonora, TX Ruffini, OscarTom Green County Jail, US 67 San Angelo, TX Ruffini, Oscar