Olga-Nadia Valavani (Greek: Όλγα-Νάντια Βαλαβάνη; born 16 August 1954) is a Greek politician and economist. She was appointed to the role of Alternate Minister of Finance in the cabinet of Alexis Tsipras on 27 January 2015. She resigned from this role on 15 July 2015, before a significant vote on the terms of a bailout package in the Hellenic Parliament.She had been a Syriza Member of the Hellenic Parliament since May 2012, but defected to Popular Unity in September 2015.