Chiajna (Romanian pronunciation: [ˈkjaʒna]) is a commune in the south-west of Ilfov County, Romania, immediately west of the capital, Bucharest. It is composed of three villages: Chiajna, Dudu and Roșu.
The commune contains Doamna Chiajna High School (Grupul Școlar Doamna Chiajna), with the following specializations: Promotional Design, Football, Yachting, Wrestling, Boxing, and Public Alimentation.
The commune is host to the football team Concordia Chiajna. The team is in Liga II, and plays its home matches on Stadionul Concordia.