The 2017 Turkish constitutional referendum 'No' campaign (Turkish: Hayır) refers to a collection of unsuccessful political campaigns led by political parties, organizations and media outlets in favour of a 'No' vote in the 2017 Turkish constitutional referendum. Were the campaign to have been successful, it would have resulted in Turkey remaining a parliamentary republic as opposed to an executive presidency, which it became as a result of the referendum, and would have constituted the first direct upset against the governing Justice and Development Party (AKP) since they took office in 2002.