Ernesto Cloma Briones Jr, known as Jon Jon Briones, is a Filipino-American actor best known for his work in musical theatre.

He began work on Broadway in the original production of Miss Saigon as an ensemble member and continued on the touring cast. Briones would go on to play a main character, The Engineer, in the West End revival of Miss Saigon 25 years later - which earned him a Best Actor nomination at the Laurence Olivier Awards.