Guillermo Jaime Jorrín (born November 12, 1969), known as Willie Jorrín, is a Mexican-American former professional boxer who competed from 1993 to 2003. He held the WBC super bantamweight title from 2000 to 2002. Jorrín was trained by five-time Trainer of the Year Freddie Roach.^[1]

Jorrín holds an amateur win over Wayne McCullough in McCullough's home country of Northern Ireland.

Willie made his professional debut on February 12, 1993, with a first round knockout victory over Esau Diegues. This was the first of three consecutive first round knockout victories for Jorrín. On October 1 of that year, Pat Chávez became the first person to go the distance with Jorrín, losing a six-round decision to the Sacramento fighter.

He faced Enrique Jupiter on June 7, 1997. Jupiter was a ranked contender and Jorrín beat him by a ten round unanimous decision. Jorrín then became a ranked challenger by the WBC. Jorrin outpointed Juan Luis Torres, also over ten rounds, on December 4, 1997.

Jorrín won all three of his fights in 1998, including a four round knockout over Enrique Valenzuela. He kept his winning ways in 1999, winning three fights, among them, a twelve round decision over Aristead Clayton and a five round knockout over Juan Luis Torres in a rematch. After those wins, he was ranked as the world's number one contender by the WBC.

• List of Mexican boxing world champions
• List of super bantamweight boxing champions
• List of WBC world champions