Fortitude Valley Post Office, Heritage postal building in Fortitude Valley, Australia.

Fortitude Valley Post Office is a two-story brick building located at the corner of Ann and Ballow Streets, featuring decorated rendered mouldings and cast iron balconies. The ground floor originally contained postal and telegraph services, while the upper level functioned as living quarters for the postmaster.

The Fortitude Valley Post Office and Telegraph Office was built in 1887 by William Ferguson to unsigned drawings from the Colonial Architect's Office, attributed to John James Clark or George St Paul Connolly. It was one of only two masonry post offices built in Queensland that year, the rest being timber. The government bought the Ann and Ballow Streets site in 1884 despite local calls for a position at Brunswick and Wickham Streets; the dispute was only closed in 1936, when Melbourne refused funds for a new office.

The building displays typical features of Victorian Italianate design that remain uncommon in Queensland today. The decorated facades and cast iron details reflect the importance that postal services held in the community during that era.

The former post office stands at 740 Ann Street, on the corner with Ballow Street, a short walk from Fortitude Valley's main shopping streets. The 1970 two-storey rear wing now abuts Ballow Street, so the building is best read from the Ann Street frontage and the corner vestibule. It is a heritage-listed former post office, not a working one.

A 1929 report by the Acting District Inspector recorded 1,205 pensions paid weekly from this office, described as the heaviest pensions-paying centre in Australia with one exception. The building also lost its mansard roofs and cast concrete capitals, apparently before 1949, though no documentation of the removal has been found.