Deriba Merga Ejigu (Amharic: ደርባ መርጋ አጅጉ; born 26 October 1980) is an Ethiopian professional long-distance runner. He mainly competes in the marathon. He finished fourth in that event at the 2008 Beijing Olympics and went on to win the Boston Marathon the following year. His personal best for the distance is 2:06:38 hours. He also competes in half marathon races and his time of 59:14 minutes in 2008 was the fastest that year. He won the 2006 Paris Half Marathon and took the gold medal at the 2007 All-Africa Games a year later.