Transparency has been trumpeted by many as the key to trust in government. The assumption is that if government organisations open up and show the public what decisions are made, how they are made and what the results are, people will automatically have more trust in government. But does transparency really lead to more trust? Or will it only provide critical citizens with more information to blame government again and again for small mistakes? Transparency and Trustexamines the effects of transparency on trust in a government organisation. By using an experimental method this study moves beyond normative or correlational research on transparency. In doing so, causal inferences regarding the relation between transparency and trust are allowed. Several objects of transparency and dimensions of information are being put to the test in three experiments. The experiments show that transparency is merely a ‘hygiene factor’: it does not contribute to higher levels of trust and it can even lead to lower levels of trust if people are disappointed with the degree to which government is transparent. This conclusion challenges current overly optimistic assumptions concerning the effect of transparency on trust.