Blackdown or Black Down may refer to:
Places
Australia
Blackdown, Queensland, a locality in the Central Highlands Region Blackdown Tableland National Park in Queensland.
Canada
Blackdown Cadet Training Centre, a Canadian Cadet training centre (Tri-Force) located at CFB Borden, Ontario.
England
Blackdown, Dorset, a village near Chard Black Down, Dorset, a hill near Portesham Blackdown, Hampshire, a village near Winchester Black Down, Somerset, a hill in the Mendip Hills Blackdown, Warwickshire, a village near Leamington Spa Blackdown, West Sussex, a hill also spelt Black Down Blackdown Hill, Dorset, one of Dorset's highest points Blackdown Hills, a range of hills in Somerset and Devon Princess Royal Barracks, Deepcut (Blackdown Camp), a World War II army camp near Aldershot, Hampshire
Computing Blackdown Java, a port of Sun's Java virtual machine to Linux.
Popular culture "Blackdown", a song by Patrick Wolf from The Bachelor "Blackdown", a song by French artist Laurent Voulzy from Lys & Love