The Mayor's Office for Policing And Crime (MOPAC) was established on 16 January 2012. It is led by the Mayor of London, Boris Johnson and supported (since 1 June 2012) by the Deputy Mayor for Policing and Crime (DMPC), Stephen Greenhalgh.

The Mayor, Boris Johnson, has several key roles as occupant of MOPAC, most importantly, setting the strategic direction and accountability for policing the capital (excluding the City of London), in consultation with the public and victims of crime, as well as the commitments made in his manifesto. The Mayor achieves this by publishing a Police and Crime Plan. He must ensure that the public, the vulnerable and victims are represented.