Ubaldo Oppi (29 July 1889 – 25 October 1942) was an Italian painter, one of the founders of the Novecento Italiano in Milan.
He was born in Bologna, Italy, but by the age of 4 years, his father, a shoe salesman, had moved to Vicenza.
He was sent by his father North to the German countries to learn the shoe trade, but elected to stay in Vienna (1907–1909), and study under Gustav Klimt.
In 1922, along with the following: Anselmo Bucci, Leonardo Dudreville, Achille Funi, Emilio Malerba, Piero Marussig, and Mario Sironi, he was one of the founders of the Novecento Italiano, patronized by Margherita Sarfatti and the incipient fascist party.
In 1926–28, he frescoed the Chapel of San Francesco in the Basilica of St Anthony in Padua, and in 1932, for the church of Bolzano Vicentino.