The Old Castlemaine Gaol was a prison located in Castlemaine, Victoria, Australia. The prison was modelled on Pentonville; the present building replaced the original, designed by Inspector General John Price, was never occupied. Built in 1861 to house offenders from the goldfields and nearby towns, it served various functions in the penal system before it was closed down and its prisoners transferred to HM Prison Loddon in 1990. Since, it has been used as a hotel and tourist attraction. It currently serves as the studio for local community radio station WMA FM 94.9.
The grounds were originally landscaped by renowned landscape gardener Hugh Linaker.