| Walter López | |
| Fullname: | Walter Alexander López Castellanos[1] |
| Birth Date: | 25 September 1980[2] |
| Birth Place: | Guatemala City, Guatemala |
| League1: | Liga Nacional de Fútbol de Guatemala |
| Role1: | Referee |
| Internationalyears1: | 2006– |
| Confederation1: | FIFA listed |
| Internationalrole1: | Referee |
Walter Alexander López Castellanos (born 22 September 1980) is a Guatemalan football referee. He refereed at 2014 FIFA World Cup qualifiers and 2018 FIFA World Cup qualifiers.[3]