Alejandro Neciosup Acuña aka Alex Acuña (born December 12, 1944) is a Peruvian drummer and percussionist, in the Afro-Cuban jazz style.

Born in Pativilca, Peru, Acuña played in local bands from the age of ten, and moved to Lima as a teenager. At the age of eighteen he joined the band of Perez Prado, and in 1967 he moved to Puerto Rico. In 1974 Acuña moved to Las Vegas, working with artists such as Elvis Presley and Diana Ross, and the following year he joined the jazz-fusion group Weather Report, appearing on the albums Black Market and Heavy Weather. Acuña left Weather Report in 1978, and became a session musician in California, recording and playing live with (amongst many others) Paul McCartney, Joni Mitchell, Ella Fitzgerald, Elvis Presley, Jim Walker, Chick Corea, Whitney Houston, Plácido Domingo, Phil Keaggy, Sergeant Petter, Sam Phillips, former Weather Report bandmates Wayne Shorter and Joe Zawinul, Herbie Hancock, Carlos Santana, Antonio Carlos Jobim, Beck, Roberta Flack, U2, Al Jarreau and Don Moen (singer). He can be found on recordings by musicians as culturally diverse as Javier Malosetti, Lee Ritenour, Peter Gabriel, Johnny Clegg, Roy Orbison, YellowJackets, Lalo Schiffrin, Vanessa Rubin, Salif Keita, Matthew Garrison, Gary Poulson, Bobby Malach, Mike Mossman, Bobby Enriquez, Don Grusin, The Imperials, Phil Keaggy, Jeff Linsky, Mijares, Rudy Regalado, John Patitucci, Sadao Watanabe, Lyle Mays, Eric Tagg, Diana Ross, David Benoit, Sergio Mendez, Robbie Robertson, Jackson Browne and Flavio Sala.