Aselefech Mergia Medessa (Oromo: Asallafach Margaa Mardaasaa; Amharic: አሰለፈች መርጊያ; born 23 January 1985) is an Ethiopian long-distance runner who competes in the marathon.

[8] She returned to defend her Bangalore 10K title in May, but was beaten to the tape by compatriot Wude Ayalew and, finishing two seconds behind her, Mergia had to settle for the runner-up position.

[9] She regained her Delhi Half Marathon title in November: learning from the poor pacing which had left her in ninth place the previous year, she stuck to the front and won the race in a sprint finish ahead of Merima Mohammed.

[11] She was chosen for the Ethiopian marathon team at the 2011 World Championships and was in twelfth at the 40 km point of the race, but dropped out in the final kilometres.

[12] An attempt to defend her Delhi Half Marathon title ended in a third-place finish, although she improved her best time by a second.