| Omar Arellano | |
| Fullname: | Omar Arellano Nuño |
| Birth Date: | 29 May 1967 |
| Birth Place: | Tampico, Tamaulipas, Mexico |
| Height: | 1.79m (05.87feet) |
| Currentclub: | Dragones de Oaxaca (Manager) |
| Position: | Midfielder |
| Years1: | 1985–1996 |
| Years2: | 1995–1998 |
| Years3: | 1999–2001 |
| Years4: | 2001–2002 |
| Clubs4: | Pachuca |
| Caps1: | 196 |
| Goals1: | 19 |
| Caps2: | 64 |
| Goals2: | 3 |
| Caps3: | 7 |
| Goals3: | 1 |
| Caps4: | 22 |
| Goals4: | 0 |
| Nationalyears1: | 1989 |
| Nationalteam1: | Mexico |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
| Manageryears1: | 2003 |
| Manageryears2: | 2005–2006 |
| Manageryears3: | 2006 |
| Manageryears4: | 2007 |
| Manageryears5: | 2007–2008 |
| Manageryears6: | 2009 |
| Manageryears7: | 2009 |
| Manageryears8: | 2009–2010 |
| Manageryears9: | 2011–2012 |
| Manageryears10: | 2013 |
| Manageryears11: | 2014 |
| Manageryears12: | 2016–2018 |
| Manageryears13: | 2019–2020 |
| Manageryears14: | 2020–2022 |
| Manageryears15: | 2023 |
| Manageryears16: | 2024– |
| Managerclubs1: | Pachuca Reserves (Assistant) |
| Managerclubs2: | Santos Laguna (Assistant) |
| Managerclubs5: | Atletico de Madrid (Assistant) |
| Managerclubs6: | Guadalajara (Assistant) |
| Managerclubs16: | Dragones de Oaxaca |
Omar Arellano Nuño (born 29 May 1967) is a Mexican former professional footballer who played as a midfielder and current manager. He played for Tigres UANL during the 1995-96 season.
As of April 2009 he was the manager at Chivas Guadalajara,[1] and he managed Necaxa in 2010.[2]