West Arsi (Oromo: Arsii Lixaa/Dhihaa) is a zone in the Oromia Region of Ethiopia.

This zone is named after a subgroup of the Oromo, who inhabit it.

[2] Based on the 2007 Census conducted by the Central Statistical Agency of Ethiopia (CSA), this Zone has a total population of 1,964,038, of whom 973,743 are men and 990,295 women.

The two largest ethnic groups reported in West Arsi were the Oromo (88.52%) and the Amhara (3.98%); all other ethnic groups made up 7.5% of the population.

[3] The population was officially estimated at 2,929,894 in mid 2022, comprising 1,446,807 males and 1,483,087 females.