Boards of improvement commissioners were ad hoc urban local government boards created during the 18th and 19th centuries in the United Kingdom of Great Britain and Ireland and its predecessors the Kingdom of Great Britain and the Kingdom of Ireland. Around 300 boards were created, each by a private Act of Parliament, typically termed an Improvement Act. The powers of the boards varied according to the acts which created them. They often included street paving, cleansing, lighting, providing watchmen or dealing with various public nuisances. Those with restricted powers might be called lighting commissioners, paving commissioners, police commissioners, etc.