The Street family is an Australian dynasty, founded by the banker and politician John Street and his wife Susanna, the daughter of Australian explorer Commandant William Lawson. Their son Sir Philip Whistler Street, grandson Lieutenant-Colonel Sir Kenneth Whistler Street, and great-grandson Colonel Sir Laurence Whistler Street served as Chief Justice of the Supreme Court of New South Wales and Lieutenant-Governor of New South Wales. Sir Kenneth's wife Lady "Red Jessie" Street was Australia's first female delegate to the United Nations and his cousin Brigadier Geoffrey Street was Minister of Defence in World War II, as well as the father of Anthony "Tony" Street, who was Minister of Foreign Affairs. Sir Laurence's son Commander Alexander "Sandy" Street, daughter Lieutenant-Commander Sylvia Emmett and son-in-law Professor Arthur Emmett serve as federal judges.

William Lawson, MLC was a British soldier, explorer, land owner, grazier and politician who migrated to Sydney, New South Wales in 1800. Along with Gregory Blaxland and William Wentworth, he pioneered the first successful crossing of the Blue Mountains by British colonists.