Rosny is a suburb of the City of Clarence, part of the greater Hobart area, Tasmania, Australia. It is located on the eastern shore of the Derwent River, between the suburbs of Montagu Bay and Rosny Park, approximately 4 kilometres from Hobart’s centre. Rosny is the residential part of its commercial namesake Rosny Park.

Rosny is serviced by local Metro Tasmania bus route 676 with this service terminating at the Elizabeth Street Bus Mall in Hobart. On weekdays, Route 676 leave Rosny Bus Mall at 7:25 am, 8:12 am, and hourly from 9:31 am until 2:31 pm. Route 676 departs Elizabeth Street Bus Mall in Hobart at 3:24 pm, 4:24 pm and 5:24 pm. There is no weekend or public holiday service. Many residents drive or walk to the bus stop under the Rose Bay High School overpass, near the Clarence Pool, where buses on Metro routes (601, 615, 616, 624, 625, 634, 635, 646) can be hailed. These route operate as a high frequency service, every 10 minutes Monday to Friday, 7 am to 7 pm. These routes are part of ‘Turn Up and Go’ network introduced 11 January 2016.