Sir Ian Warwick Blair, QPM is a senior United Kingdom police officer who currently holds the office of Commissioner of Police of the Metropolis, or head of the Metropolitan Police Service.

Blair is responsible for the policing of the metropolitan area in the capital city of London, with the notable exception of the City of London itself. The relatively small area of the City of London, essentially London's financial district, is policed by its own City of London Police, under the command of its own Commissioner.