Mersa (Amharic: መርሳ) also known as Mersa-Abagetye (Amharic፡ መርሳ አባ ጌትየ)is a city administration in Habru Woreda of the Semien Wollo (North Wollo) of the Amhara Region (or kilil) in Ethiopia. It has a latitude and longitude of 11°40′N 39°39.5′E / 11.667°N 39.6583°E / 11.667; 39.6583, with an elevation of 1600 meters. The city it is the administrative center of Habru Woreda. Mersa is located along Ethiopian Highway 2.

Mersa was a victim of rocket attack by Derg at the beginning of 1990. Jenny Hamond described the incident as: "It was the site of a terrible atrocity by the retreating Derg forces as the Front fighters closed in on them in 1990. They retreated to a safe distance and then they turned their heavy BM rocket launchers onto the defenseless town."