The New York City Police Riot of 1857, known at the time as the Great Police Riot, was a conflict which occurred in front of New York City Hall between the recently-dissolved New York Municipal Police and the newly-formed Metropolitan Police on June 16, 1857. Arising over New York City Mayor Fernando Wood's appointment of Charles Devlin over Daniel Conover for the position of city street commissioner, amid rumors that Devlin purchased the office for $50,000 from Wood, Municipal police battled Metropolitan officers attempting to arrest Mayor Wood.

New York City Hall is the seat of New York City government, located at the center of City Hall Park in the Civic Center area of Lower Manhattan, between Broadway, Park Row, and Chambers Street. Constructed from 1803 to 1812, the building is the oldest city hall in the United States that still houses its original governmental functions. The building houses the office of the Mayor of New York City and the chambers of the New York City Council. While the Mayor's Office is in the building, the staff of thirteen municipal agencies under mayoral control are located in the nearby Manhattan Municipal Building, one of the largest government buildings in the world, with many others housed in various buildings in the immediate vicinity.