140 William Street (formerly BHP House) is a 41-storey 152m tall steel, concrete and glass building located in the western end of the central business district of Melbourne, Victoria, Australia.

Constructed between 1969 and 1972, BHP House was designed by the architectural practice Yuncken Freeman alongside engineers Irwinconsult,[1] with heavy influence of contemporary skyscrapers in Chicago, Illinois.

The local architects sought technical advice from Bangladeshi-American structural engineer Fazlur Rahman Khan, of renowned American architectural firm Skidmore, Owings & Merrill, spending ten weeks at its Chicago office in 1968.

[4] The building's expressed gridded structure was a clear break from the sheer curtain walls of the 1950s and 1960s, and like the pioneering skyscrapers of Mies van der Rohe, it was designed as a three dimensional sculptural monument, detached from the surrounding cityscape.

[4] In the architectural field, BHP House is regarded as one of the most notable projects by Yuncken Freeman Architects due to cutting edge techniques for an office building such as flush glazing, minimalist interiors and expressed structural bracing.