Arturo Frias, born October 27, 1955, in Montebello, California, is an American former professional boxer who competed from 1975 to 1985 and held the World Boxing Association (WBA) lightweight title from 1981 to 1982.

From East Los Angeles, he attended Eastman Elementary, Stevenson Junior High, and Roosevelt High School but dropped out in his junior year at age 16 to pursue boxing full-time, amassing an amateur record of 102 wins and 9 losses, including Southern California Golden Gloves and AAU Championships at 125 pounds.

He turned professional on February 7, 1975, at just over 18, defeating Alfredo Medrano by six-round unanimous decision in San Diego, and quickly built momentum with victories over more experienced fighters like Eddie Murray by technical decision in his third bout.​​

Transitioning to a more aggressive style under trainer LRA after his bob-and-weave amateur approach, he racked up early wins at the Olympic Auditorium in Los Angeles, including knockouts of Juan Sanchez and Enrique Paz, maintaining an undefeated record through 20 fights by April 1981.

His first loss came via majority decision to Ernesto España in May 1981 in Caracas, Venezuela, but he rebounded with triumphs over Rosendo Ramirez and Juan Graciano before earning a title opportunity when Claude Noel's opponent withdrew.

On December 5, 1981, Arturo Frias captured the WBA lightweight crown by eighth-round knockout over Noel at the Showboat Hotel in Las Vegas, defending it twice against España by technical decision and retaining it until a first-round TKO loss to Ray Mancini on May 8, 1982, at the Aladdin in Paradise, Nevada.​​

Arturo Frias challenged for the vacant USBA lightweight title in July 1982 but suffered a fifth-round TKO defeat to Ruben Munoz Jr. in Atlantic City. He returned with wins over Javier Rios, Joe Perez, and Jerry Lewis in 1983, but losses to Kelvin Lampkin by ninth-round TKO in 1984 and Bobby Chacon by seventh-round TKO in 1985 marked the end of his career, retiring with a record of 28 wins (8 by knockout), 5 losses, and 0 draws across 33 bouts.

Of Mexican descent, he worked as a shipping clerk to support his training and became known for his speed, grit, and resilience in the lightweight division during a competitive era.