He studied in Toulouse, Rome (with Antonio Cotogni), and at the Conservatoire de Paris, where he won a first prize in 1902. That same year he made his debut at the Paris Opera as Silvio in Leoncavallo's Pagliacci. In 1908 he left the Paris Opera and from 1909 to 1914 he performed at the Metropolitan Opera in New York City. He also sang at The Royal Opera House, Covent Garden, and later taught in London. During this period he also headlined on fourteen occasions at the Royal Albert Hall, London.  His students there included Dennis Noble.
On 4 January 1925, he opened the 'Dinh Gilly School of Singing' at Brinsmead Studios, 17 Cavendish Square, London with fellow singer Margaret Bruce. 
- Sunday Concert programmes, Royal Albert Hall Archives, (RAHE/1/1924/91/SC)
- Barnes, Harold. "Gilly, Dinh". Grove Music Online. Retrieved 2008-12-05.
- Gilly, Dinh (Baritone), Metropolitan Opera performance archives. Retrieved on 2008-12-07.