Milton House, Art Nouveau hospital building in Flinders Lane, Melbourne, Australia

Milton House is a broadly Georgian composition at 21–25 Flinders Lane, built in 1901, with a Romanesque arch and Art Nouveau detailing. The ornamental terracotta band, the sinuous entrance arch, the wrought-iron work within the arch and the door are attributed to architect Robert Joseph Haddon.

Built in 1901 for surgeon William Moore, the first master of surgery graduate of the University of Melbourne, Milton House served as a private hospital. Its Flinders Lane site was likely chosen for its proximity to the medical professionals concentrated at the top of Collins Street. It later became a rooming house, then in 1950 the Victorian Health Commission ran an X-ray facility here as part of the postwar campaign against tuberculosis. It subsequently housed government and then private offices.

The building shows how European design ideas entered Australian cities at the start of the 20th century through medical and commercial buildings. The ornate terracotta decoration and wrought-iron details on the facade were signs of wealth and modern taste.

The building sits on Flinders Lane in Melbourne's central area, within walking distance of Collins Street where medical professionals historically gathered. The location is easy to access on foot and surrounded by other historic buildings in the city center.

The 1901 building was designed by Sydney Smith & Ogg, but the Art Nouveau ornament is attributed to Robert Joseph Haddon (1866–1929): the terracotta band, the sinuous entrance arch and the wrought-iron work inside it. In 2022 a tower was proposed for the small plaza next door, partly overhanging Milton House.