Murchison is a locality in the Mid West region of Western Australia. At the , Murchison recorded a population of 30.
As of the 2021 Australian census, 30 people resided in Murchison, down from 62 in the . The median age of persons in Murchison was 44 years. There were fewer males than females, with 46.9% of the population male and 53.1% female. The average household size was 2 people per household.