Tumbarumba Shire was a local government area in the eastern Riverina region, located in the foothills of the Snowy Mountains, on the upper reaches of the Murray River in New South Wales, Australia. It came into existence in 1906. Prior to this the area covered by the shire was unincorporated. It included the town of Tumbarumba and the small towns of Rosewood, Tooma, Khancoban and Jingellic.

A 2015 review of local government boundaries recommended that the Tumbarumba Shire merge with the Tumut Shire to form a new council. This recommendation was not supported by any of the preceding IPART and Tcorp assessments, which recommended a merger between Tumut and Gundagai shires instead. When the NSW Government released their proposal in December 2015, the Government's website stated that the proposal was 'broadly consistent with Tumut Council's stated preference'.^{[citation needed]} Tumut Council submitted its preferences during a consultation period following the IPART's 'Fit for the Future' report, in October 2015 after it was found 'Not Fit'. Tumbarumba Shire Council did not elect any merger partners as part of this process, with the finding it was 'Fit' as a 'Rural Council'.^{[citation needed]}

As a result, many residents of Tumbarumba Shire viewed^[opinion] Tumut Shire Council's choice to nominate a merger of the Gundagai, Tumbarumba, and Tumut shires as the catalyst behind the NSW Government proposal to merge the Tumbarumba Shire with Tumut Shire, (which was never one of Tumut Shire Council's stated preference).^[opinion] The resulting opposition by the residents of Tumbarumba Shire was almost^[opinion] unanimous, with a publicly convened 'Save Tumbarumba Shire' committee executing an active grass roots, public campaign.^{[citation needed]}

The NSW Government proposal would see a combined Shire with an area of 8,960 square kilometres (3,460 sq mi) and support a population of approximately 14,953.^[4] On 12 May 2016, the NSW Government dissolved Tumbarumba Shire and along with Tumut Shire and merged the councils to form the Snowy Valleys Council.^[5]

The last mayor of Tumbarumba Shire was Cr. Ian Chaffey, an independent politician.^[3]