Katoomba (postcode: 2780) 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 110 km (68 mi) west of Sydney and 39 km (24 mi) 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 2011 census, Katoomba had a population of 8,016 people.