Valentine is a suburb of the City of Lake Macquarie in New South Wales, Australia 20 kilometres (12 mi) from Newcastle's central business district along the eastern shoreline of Lake Macquarie near the town of Belmont.
Coal was mined at Valentine before it became a suburb in the 1950s. The public school opened in 1958. It is now a large residential district, a development commenced in the late 1980s. Valentine is home to number of convenience and specialty shops, including a butcher, post office, GP office, petrol station, newsagent and a bowling club.
Valentine was named after Mr Henry Valentine Joseph Geary, a property speculator and company director who grew up in Melbourne, Victoria, and settled in NSW after 1909, speculating in mining. He owned land in Valentine, but lived on the Hawkesbury River, and died in 1933. Henry Halloran, a surveyor who surveyed the area in 1916 prior to subdividing the land, named the area after him. He was also responsible for surveying many of the suburbs in Sydney, including Seaforth.