Facundo José Arregui (born 15 September 1997) is an Argentine Paralympic swimmer who competes at international swimming competitions.

He is a Parapan American Games champion and a World silver medalist in freestyle swimming.

He also competed at the Argentina at the 2016 Summer Paralympics where he finished fifth place in the 400 m freestyle S7 event.

[1] Arregui's father is Fernando Arregui is a water polo player, he competed in the water polo at the 2011 Pan American Games and is also Facundo's swimming coach.

Facundo's sister Camilla Arregui is a synchronized swimmer who has competed at the 2017 and 2019 World Aquatics Championships.