Horizon Apartments, Residential high-rise in Darlinghurst, Australia.

Horizon Apartments is a 143.9-metre, 43-storey residential tower at 184 Forbes Street, between Liverpool and William Streets in Darlinghurst, Sydney. Designed by Harry Seidler, the prestressed concrete building has a scalloped facade finished in rendered concrete and holds 260 apartments across 32,000 square metres of floor space. Its upper-quarter apartments have east-facing balconies toward the Pacific, and the siting and shape were chosen for views of the Opera House and Harbour Bridge.

Horizon Apartments was built between 1996 and 1998 by Melbourne-based Grollo Constructions, known as Grocon, to a design by Austro-Australian architect Harry Seidler. The 43-storey tower at 184 Forbes Street drew controversy over its height and the shadows it casts on neighbouring buildings. It won the 1999 Wilkinson Award from the NSW Chapter of the Australian Institute of Architects.

The building received the 1999 Wilkinson Award from the New South Wales Chapter of the Australian Institute of Architects for residential design. This award is one of the most recognized honors in Australian architecture.

The tower stands on Forbes Street in Darlinghurst, a central part of Sydney that is easy to reach on foot from nearby areas. Since it is a private residential building, access inside is limited to residents and their guests.

Harry Seidler was one of the first architects to bring a modernist high-rise approach to Australia, and this tower was among his last major residential projects. Seidler was born in Vienna and arrived in Australia as a refugee, which makes his lasting influence on the country's 20th-century architecture all the more notable.