Deriba Merga Ejigu (Amharic: ደርባ መርጋ አጅጉ; born 26 October 1980) is an Ethiopian professional long-distance runner.

He was born in the Welega Province west of Addis Ababa and he headed to the capital in 2005 to pursue a running career after winning some regional races.

Later that year, he finished sixth at the 2006 IAAF World Road Running Championships, helping Ethiopia to a bronze medal in the team competition.

[8] He set a course record of 1:02:31 at the Bogota Half Marathon in August, easily seeing off the more favoured Zersenay Tadese and Isaac Macharia.

[10] He put the disappointment behind him at the Major General Hayelom Araya 15km Championships in February 2011, where he dominated his national rivals – his time of 41:54.84 left him with a winning margin of 45 seconds and brought him an African all-comers record for the distance.

[11] He headed to the Ras Al Khaimah Half Marathon soon after and immediately assumed the lead in the race, running a world best for 8 km and winning the event in a time of 59:25 minutes.

[15] He ran at the Frankfurt Marathon in October but could not keep up with the near-world record pace set by Wilson Kipsang Kiprotich and dropped out at the 30 km point.