Public procurement, one of the largest areas of public spending worldwide, gives public officials wide discretion. It is therefore unsurprising that it is also one of the government functions most often vulnerable to corruption. While there have been many qualitative accounts of high-level corruption in public contracting, it is only recently that quantitative indicators have become available. By making use of big data generated by governments on contracts, companies, and individuals, it is possible to develop a new generation of quantitative indicators which can be used to guide policy intervention and support control of corruption.