History House, Sydney, Heritage research center in Sydney, Australia

History House at 133 Macquarie Street is a three-storey Victorian town house designed by George Allen Mansfield for his uncle George Oakes, with drawings dated December 1871 and completion around 1872. The ground floor held an entrance hall, drawing room and dining room, with bedrooms and dressing rooms above; a rear wing housed service areas and servants' quarters, reached by a second staircase.

The site lay in the Governor's Domain until the late 1840s, when the grounds of the demolished First Government House were subdivided; the allotment sold in 1849 for £300. George Oakes bought the land in 1857 and had George Allen Mansfield design the house in 1871, completed about 1872. Oakes died in 1881 after a steam tram accident in Elizabeth Street, and the house later served as a club, boarding house and doctors' rooms before passing to the Royal Australian Historical Society. It was added to the New South Wales State Heritage Register on 2 April 1999.

The house is also known as Wickham House, and its name recalls George Oakes, for whom architect George Allen Mansfield drew up plans in December 1871. Oakes, a pastoralist and politician, was knocked down by a steam tram in Elizabeth Street on 10 August 1881 and died a few hours later. The Royal Australian Historical Society now keeps its library and archives here.

Visitors can access the collection by appointment during regular opening hours, with books, archives, and digital materials available for research. It is advisable to contact ahead to arrange the best time for your visit.

A second staircase in the rear service wing let servants reach the half landings of the main stairs through separate doors, so they could move through the house without being seen by the family or guests.