Domingo Leonor III (born November 14, 1962), better known as JB Leonor or Junboy Leonor, is a Filipino drummer and songwriter, best known as the co-founder of the Filipino rock/new wave band The Dawn. Leonor formed the band along with guitarist Teddy Diaz in 1986. As a songwriter, he wrote "I Stand With You" and co-wrote "Give Me the Night" with Jett Pangan.
Leonor is married to Gina Ocampo in 2003. They have two children; Anika and Adriel Martin.