Rialto Towers (often The Rialto) is the second tallest reinforced concrete building and the tallest office building or skyscraper in the Southern Hemisphere, when measured to its roof. (Several other skyscrapers in Australia are taller if their spires are included, as are some other structures such as communications masts and observation towers). The Rialto's street address is 525 Collins Street, in the western central business district of Melbourne, Australia.

Designed by architects Gerard de Preu and Partners in association with Perrott Lyon Mathieson, Rialto Towers was built between 1982 and 1986, opening in October 1986, and takes its name from the much older Rialto Building next door. The massive glass façade, the building's central feature, changes colour during the day, ranging from a trademark dark blue to a brilliant gold during sunset.

It is 251 m (824 ft) high, constituting 63 floors (and 3 basement floors). The structure comprises two conjoined towers, the shorter North Tower being 185 m high with 43 floors. In total, there are 84,000 m² of office space.

Early tenants moved into the lower floors while the upper floors were still under construction in 1984.

The Melbourne Observation Deck opened to the public on July 19, 1994 and is located on the 55th floor of the South Tower, at 234 m. Views of up to 60 km can be had on a clear day. It is serviced by two express passenger lifts.

There are a total of 1,450 steps to the top of the building, which are the setting for a yearly Run Up race.

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