The annual Corruption Perceptions Index (CPI), published by Transparency International (TI), has had a pivotal role in focusing attention on corruption. Despite recent critiques of the CPI, it remains highly influential on research into the causes of corruption and is also extensively used to galvanise support for measures to fight corruption. In this article we explore the CPI in more depth in order to highlight how the index has been used for political ends which may not always turn out to be supportive of anti-corruption efforts. The argument is developed in four sections: in the first,we focus onTransparency International’s definition of corruption, highlighting some conceptual difficulties with the approach adopted and its relationship...