| Ubaldo Aquino | |
| Full Name: | Ubaldo Aquino Valenzano |
| Birth Date: | May 2, 1958 |
| Otheroccupation: | Referee Coordinator |
| Years1: | 1994-2003 |
| League1: | Paraguayan Football Association |
| Role1: | Referee |
| Years2: | 2003-Present |
| League2: | Paraguayan Football Association |
| Role2: | Referee Coordinator |
| Internationalyears1: | 1994-2003 |
| Confederation1: | CONMEBOL |
| Internationalrole1: | Referee |
| Internationalyears2: | 1995-2003 |
| Confederation2: | FIFA |
| Internationalrole2: | Referee |
Ubaldo Aquino Valenzano (born May 2, 1958) is a retired football referee from Paraguay,[1] best known for supervising two matches (Germany-Saudi Arabia[2] and Sweden-Senegal)[3] during the 2002 FIFA World Cup in South Korea and Japan.[4]
Aquino is known to have served as a FIFA referee during the period from 1995[5] to 2003.[6] He officiated in numerous international competitions, including the 1999 FIFA Confederations Cup,[7] 1997 FIFA World Youth Championship,[8] and qualifying matches for the 1998,[9] 2002,[10] and 2006 World Cups. Aquino also served as a referee in the 1999[11] and 2001 Copa América competitions, officiating the final in 2001.[12]
After retiring from his career as a match official, Aquino has worked as referee coordinator for the Asociación Paraguaya de Fútbol.[13]