David Roland Joseph O'Brien (born 2 September 1970) is an Australian politician who represented the National Party in the Victorian Legislative Council.
O'Brien has also been the licensee of the Penshurst Hotel and involved in primary production and live music, being a bass player in local Melbourne bands Loin Groin, the Histrionics and Stubble.
David was involved as a supporter of Live Music in the “Save the Espy” Campaign in the late 1990s and early 2000s concerning the Esplanade Hotel in St. Kilda Victoria.
[1] O'Brien was the Deputy Leader of the Nationals in the Legislative Council, but lost his seat in 2014 to James Purcell, representing Vote 1 Local Jobs.
In September 2015, O'Brien was pre-selected by the National Party to contest the Polwarth state by-election following the resignation of the Liberal MP Terry Mulder.