Alejandro Neciosup Acuña (born December 12, 1944), known professionally as Alex Acuña, is a Peruvian-American drummer and percussionist.

Born in Pativilca, Peru, Acuña played in local bands such as La Orquesta de los Hermanos Neciosup from the age of ten. Acuña then followed his brothers and moved to Lima as a teenager. At the age of eighteen he joined the band of Perez Prado, and in 1965 he moved to San Juan, Puerto Rico. In 1974 Acuña moved to Las Vegas, working with artists such as Elvis Presley, The Temptations, and Diana Ross, and the following year he joined the jazz-fusion group Weather Report, appearing on the albums Black Market and Heavy Weather. While in New York City, Acuña recorded several songs under RCA records. Acuña decided to leave because of the genre limitations placed on him, in which RCA records only had him play Latin music.

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, Michael Jackson, Chick Corea, Whitney Houston, Plácido Domingo, former Weather Report bandmates Wayne Shorter and Joe Zawinul, Herbie Hancock, Carlos Santana, Antonio Carlos Jobim, Beck, Roberta Flack, U2, Al Jarreau and Marcos Witt. He can be found on recordings by musicians as culturally diverse as Lee Ritenour, Johnny Clegg, Roy Orbison, YellowJackets, Lalo Schifrin, Milton Nascimento, Don Grusin, Dave Grusin, The Brecker Brothers, Arturo Sandoval, Vladislav Sendecki, Paquito d’Rivera, Gonzalo Rubalcaba, Brad Mehldau, BoDeans, Paco de Lucia, John Patitucci, Sadao Watanabe, Lyle Mays, Diana Ross, Sérgio Mendes, Robbie Robertson, Jackson Browne, Bette Midler, Jennifer Nettles, Christina Aguilera, Seal and Chris Botti.