Force One is a specialised counter terrorism unit of the Mumbai Police to guard the Mumbai metropolitan area, one of the largest metropolitan areas in the world, formed by the Government of Maharashtra on the lines of National Security Guards (NSG). It was formed under Maharashtra Police, as a response to the 2008 Mumbai terror attacks and was commissioned two days before its first anniversary at the time of establishment Shri Jayant Patil was State Home Minister of Maharashtra. On the occasion, Maharashtra Chief Minister Ashok Chavan also laid the foundation stone of the Force One's headquarters in Mumbai. One of the primary tasks of the unit will be to protect the Maharashtra Legislature as well as several politicians within the state.

The Mumbai Police is the police department of the city of Mumbai, Maharashtra. It is a part of Maharashtra Police and has the primary responsibilities of law enforcement and investigation within the limits of Mumbai. The force's motto is "Sadrakṣaṇāya Khalanigrahaṇāya".