Abraham Isaac Quintanilla III (born December 13, 1963), better known as A.B. Quintanilla III or A.B. Quintanilla, is an American record producer, songwriter, and musician. He is the older brother of "The Queen of Tejano music" Selena. Along with Selena, his other sister Suzette, and his father Abraham, he became a member of Los Dinos in 1980 which would later include Selena's husband (later widower) Chris Pérez as a guitarist. As a member of Los Dinos, A.B. would play bass guitar, produce and write songs for Selena which became successful singles such as "Como La Flor", "Amor Prohibido" and "No Me Queda Más".
A.B.'s sister, Selena, was murdered on March 31, 1995, which greatly devastated him. He helped produce "Como Te Extraño" (How I Miss You) by Pedro "Pete" Astudillo, which was written for Selena as well as Astudillo's late grandmother. The song earned Astudillo a Premios Lo Nuestro award for Best Song of the Year in 1996.
He produced and arranged the 2004 CD, A.B. Quintanilla III Presents Joe Lopez, which includes "Cuando Estoy Contigo" [When I Am With You] and "Soy Tan Feliz" [I'm So Happy], co-written by Quintanilla and Luigi Giraldo.
Quintanilla has eight children, including sons Svani (b. about 1991) and Gianni (b. about 2000) as well as four other sons and two daughters born between 1990 and 2007. He is the oldest of the three children of Abraham Quintanilla Jr., including Selena Quintanilla and Suzette Quintanilla. He married his longtime girlfriend Rikkie Leigh Robertson on November 12, 2011.  In the movie describing Selena's life, A.B. was played by Mexican-born American actor Jacob Vargas (Rafael Tamayo played the part of A.B. when he was a child).