Yerko Bastián Leiva Lazo (born 14 June 1998) is a Chilean professional footballer who plays as a midfielder for Unión La Calera.
In 2024, Leiva joined O'Higgins on loan from Curicó Unido.
On 30 December 2025, Leiva returned to Unión La Calera after his stint in 2019.
Leiva represented Chile U17 at the 2014 South American Games.
He is the older brother of the footballer Sergio Leiva.