Nicola Vaccaj (Tolentino, 15 March 1790 - Pesaro, 5 August 1848) was an Italian composer and singing teacher. He studied music at the Accademia di Santa Cecilia in Rome and later under Giovanni Paisiello, in Naples. He had his first operatic success in Naples with I solitari di Scozia, in 1815. He moved to Venice where he wrote other operatic works and taught voice. Eclipsed by his contemporaries, Bellini, Rossini and Donizetti, he left Italy for Paris and then for London where, in 1834, he published his Metodo pratico di canto italiano per camera (Practical Vocal Method) which is still an essential teaching tool for operatic singers.