Alonnah is one of the main townships of Bruny Island. It is approximately 35 minutes drive from Roberts Point, and faces D'Entrecasteaux Channel. Alonnah is home to Hotel Bruny - Australia's southern-most pub. The Bruny Island District School, Online Access Centre, Police Station and Health Service are also located at Alonnah.

Alonnah is the main location in Bruny Island for government facilities, including post office, police station, primary school, internet centre, community library, pharmacy, and health centre with nurses, a visiting doctor, physiotherapist, and other health practitioners. There is also a museum located in the court house, Bruny Hotel, and a small general store.

The Alonnah Dray track is an easy walking track of historical value, beginning at Alonnah jetty.

Originally named Mill's Reef, it was renamed in the early 1900s after part of the Tasmanian aboriginal name for Bruny Island, Lunawanna-alonnah (a nearby township a little to its south being named Lunawanna. Mill's Reef Post Office opened on 1 February 1905 and was renamed Alonnah in 1909.

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In the early 1900s, Alonnah jetty was used by many vessels traversing the d'Entrecasteaux Channel with cargo and passengers. On Thursdays a weekly trip to Hobart took passengers shopping for the day.The pontoon that takes the place of the jetty today is the last surviving section of the Hobart Floating Arch Bridge that was in use to cross the Derwent River from October 1943 to August 1964. This section was towed to Alonnah on 27th June 1972.