Romeo Antoniazzi (b.1862, d.1925) was an Italian violin maker. He came from a long line of accomplished luthiers, Cremona's Antoniazzi family, which is at the heart of 20th-century violin making in Italy. He was taught by his father Gaetano and older brother Riccardo, whom he worked with at Leandro Bisiach's atelier. Throughout his career, he worked alone and for several shops, including Barlassina and Monzino in Milan, where he settled. He later on taught apprentices while continuing to create instruments which won in exhibitions in Paris and Turin.
His best works were made in the late 1800s, using various labels and varnishes which ranged from light yellow-orange to dark brown. His instruments, which became highly coveted and widely copied, were characterized by their spontaneity.