Katoomba is the chief town of the City of Blue Mountains in New South Wales, Australia, and the administrative headquarters of Blue Mountains City Council. Katoomba is situated on the Great Western Highway 102 km west of Sydney and 39 km south-east of Lithgow. Katoomba railway station is on the Main Western line.
Katoomba is a base for bush and nature walks in the surrounding Blue Mountains. At the 2016 census, Katoomba had a population of 7,964 people.