Alex Barrena (born 10 October 2002) is an Argentine tennis player. Barrena has a career high ATP singles ranking of No. 167 achieved on 30 March 2026 and a career high ATP doubles ranking of No. 617 achieved on 22 August 2022.
Barrena has won two ATP Challenger singles titles at the 2025 Challenger Tucumán and the 2025 Bolivia Open in Santa Cruz de la Sierra.