Windsor is a town in New South Wales, Australia.

Windsor is the third-oldest place of British settlement in Australia. Settlement at Windsor was established about 1791, near the head of navigation of the Hawkesbury River. The area was originally called Green Hills, but renamed Windsor (after Windsor in England). The town was proclaimed in about 1811.

Windsor is about 60 kilometers north-west of Sydney, and the location was chosen because of the agricultural potential of the area, and because the location was accessible both by land and by coastal shipping from Sydney.

The spread of the suburbs of metropolitain Sydney has almost reached Windsor, and the town is now regarded as an outer suburb. The Richmond line of the Cityrail network services Windsor.

Many of the oldest surviving European buildings in Australia are located at Windsor.