The Perth Gaol (often referred to as the Old Perth Gaol) was a gaol (jail) built in Perth, the state capital of Western Australia, between 1854 and 1856 to house convicts and other prisoners. It is located just west of Beaufort Street.
It operated until March 1888 when the last prisoner was transferred to Fremantle Prison. The main gaol building, minus the yards, stands today adjacent to the Western Australian Museum in Northbridge, a suburb of Perth. In addition to a number of displays of colonial and prison related artefacts, the building houses the museum's retail shop and coffee shop.
Prior to the construction of the Perth Gaol, the Swan River Colony had only the Round House in Fremantle, the partially completed Fremantle Prison (construction began in 1851 and completed in 1859) and a six-cell lock-up which had been built in about 1830 opposite Government House in Perth. With the growth of the city it was deemed that the latter was an inappropriate location for a gaol and it was demolished in 1855 (the site now occupied by The Deanery). A new site was selected by the Colonial Secretary, Charles Piesse and the Surveyor-General, John Septimus Roe and reserved on a rise on what is now near the intersection of Beaufort and Francis Streets.
With the expanding population and with the importation of convicts in 1850 to provide a labour force for public works, there was a need for a facility to house inmates near the city. A proposal was submitted to Governor Charles Fitzgerald in December 1853 for such a facility comprising two floors with a basement. The project was approved but construction took longer than expected and substantial modifications to the original design were made while work progressed. The final building comprised a cruciform layout with cells, a chapel, gaolers' quarters and prisoners' yards.