| Omar Mahmoud | |
| Fullname: | Omar Mahmoud Khalef |
| Birth Date: | 11 April 1990 |
| Birth Place: | Al-Dibs, Kirkuk, Iraq |
| Position: | Striker |
| Years1: | 2009–2013 |
| Caps1: | 1 |
| Years2: | 2013–2014 |
Omar Mahmoud Khalef (Arabic: عُمَر مَحمُود خَلَف; born 11 April 1990) is an Iraqi football striker who plays for Al-Gharafa in Qatar. He is the younger brother of Younis Mahmoud.