Western Sydney is a very general, informal, term which is used to describe the western parts of the metropolitan area of Sydney, Australia. The local government areas of Parramatta, Blacktown, Penrith, Holroyd , Fairfield, Liverpool would generally be considered to comprise "Western Sydney".

Greater Western Sydney stretches over nearly 9,000 square kilometres of residential, industrial and rural land. At its most eastern point, the region is only 30 minutes away from Sydney's central business district (CBD) and is within easy reach of international freight and transport terminals. The annual temperatures in Greater Western Sydney average a maximum of 23 degrees Celsius and a minimum of 12 degrees.

The 14 council regions which comprise the Greater West together generate more than $54 billion in economic output a year, making its economy the third largest in Australia behind the Sydney CBD and Melbourne.

Its population - already at 1.7 million - is the fastest growing in Australia. More than 150 of Australia's top 500 companies are located within the Greater West, while industries including advanced manufacturing, tourism, information technology, business services and retail trade are growing at much faster rates than the national average.

Government and economic development organisations

• NSW Department of State and Regional Development
• The Office of the Minister for Western Sydney
• Western Sydney IT Cluster

Major education facilities

• University of Western Sydney
• TAFE Western Sydney Institute of Technical and Further Education