Asella also Asela is a town and separate woreda in central Ethiopia. Located in the Arsi Zone of the Oromia Region about 175 kilometers from Addis Ababa, this city has a latitude and longitude of 7°57′N 39°7′E / 7.95°N 39.117°E / 7.95; 39.117, with an elevation of 2430 meters. Asella hosts an airport (IATA code ALK). Asella was the capital of Arsi Province until that province was demoted to a Zone of Oromia with the adoption of the 1995 Constitution. It retains some administrative functions as the seat of the present Arsi Zone.

The 2007 national census reported a total population for Asella of 67,269, of whom 33,826 were men and 33,443 were women. The majority of the inhabitants said they practised Ethiopian Orthodox Christianity, with 67.43% of the population reporting they observed this belief, while 22.65% of the population were Muslim, and 8.75% of the population were Protestant.

The 1994 national census reported this town had a total population of 47,391 of whom 21,993 were males and 25,398 were females.