Dejen Gebremeskel (Amharic: ደጀን ገብረመስቀል; born 24 November 1989) is an Ethiopian long-distance runner who primarily competes in track events.

Dejen Gebremeskel grew up in the rural setting of Gulo-Makeda woreda in northern Ethiopia and took up running as a child, representing his school.

[6] He ran for Ethiopia at the International Chiba Ekiden in 2008 and helped the team to victory, running the fastest time for his leg of the road relay.

[7] Representing the Ethiopian Banks team, he won the junior title at the 2007 Addis Ababa cross country race, beating Hunegnaw Mesfin by a second.

[6][16] He continued to focus on the track in 2011 and at the New Balance Indoor Grand Prix he defeated Mo Farah in unusual circumstances – Dejen lost a shoe on the first lap of the race, but he persisted and won in a time of 7:35.37 minutes, one of the fastest 3,000 m runs that year.

[19] He won the Carlsbad 5K race in April, holding off Eliud Kipchoge,[20] and took his first win on the Diamond League circuit with a victory at the Adidas Grand Prix in New York City.

[21] A run of 12:55.89 at the Golden Gala made him Ethiopia's second fastest 5000 m runner that season and he was selected for the national team for the 2011 World Championships in Athletics.

[26] Two 5000 m wins on the 2012 IAAF Diamond League circuit, including a personal best of 12:46.81 minutes, making him the fifth fastest ever over the distance at the time, and earning him selection for the 2012 Summer Olympics.