Pinnacle House, Heritage commercial building in Sydney central business district, Australia.

Pinnacle House is a seven-storey former warehouse at 2-6 Barrack Street, built in 1892 in the Victorian Free Classical style to designs by Sheerin & Hennessy. Its rendered stucco walls are deeply grooved and carry fluted brackets, bay windows, pediments and swags. The interior has cast iron columns and wrought iron beams.

The building was constructed between 1888 and 1892 by the Allum Brothers following designs by Sheerin and Hennessy, initially serving as a warehouse with iron columns and steel beams. A major refurbishment in the 1980s introduced modernized lifts and fire stairs to adapt it for contemporary office use.

The building's name comes from its role as the Sydney office of Gordon & Gotch, which held the lease from 1917 and occupied the warehouse for forty years from 1918. Later it served as principal offices for Mauri Bros & Thompson. The corner site sits in a precinct of similar warehouses that served Darling Harbour as a working port.

Pinnacle House occupies a corner site at 2-6 Barrack Street, with the main entrance on Barrack Street and former cart docks facing Clarence Street and York Lane. The building is now commercial office space, so interior access is generally limited to tenants and their visitors; the exterior can be viewed from the surrounding public streets.

The warehouse's cart docks opened onto Clarence Street and York Lane, while the main entrance faced Barrack Street. The basement and ground floor held strong rooms for valuables. Haltenstein's iron fireproof shutters were fitted across all staircases and lift openings.