West Welega (Amharic: Mirab Welega; Afan Oromo: Wallagga Lixaa/Dhihaa) is one of the Zones in the Ethiopian Region of Oromia. This zone is named after the former province of Welega, whose western part lay in the area West Welega now occupies.
West Wellega is bordered on the west by Kelam Welega Zone, on the north by the Benishangul-Gumuz Region, on the east for a short space by East Welega, and on the southeast by Illubabor. Its highest point is Mount Welel. Towns and cities in West Welega include Dembidolo, Gimbi, Mendi, and Nejo.
The Central Statistical Agency (CSA) reported that 40,606 tons of coffee were produced in West and East Welega combined in the year ending in 2005, based on inspection records from the Ethiopian Coffee and Tea authority. This represents 35.3% of the Region's output and 17.9% of Ethiopia's total output.
Based on the 2007 Census conducted by the Central Statistical Agency of Ethiopia (CSA), this Zone has a total population of 1,350,415, of whom 671,538 are men and 678,877 women; with an area of 10,833.19 square kilometers, West Welega has a population density of 124.66. While 146,672 or 7.39% are urban inhabitants, a further 2,578 or 0.19% are pastoralists. A total of 266,773 households were counted in this Zone, which results in an average of 5.06 persons to a household, and 250,473 housing units. The three largest ethnic groups reported in West Welega were the Oromo (96.72%), the Mao (1.45%), and the Amhara (1.2%); all other ethnic groups made up 0.63% of the population. Oromiffa was spoken as a first language by 97.06%, 1.36% spoke Mao, and 1.15% Amharic; the remaining 0.43% spoke all other primary languages reported. The majority of the inhabitants professed Protestantism, with 59.55% of the population having reported they practiced that belief, while 20.19% of the population practiced Ethiopian Orthodox Christianity and 19.66% were Muslim.