The Paris massacre of 1961 occurred on 17 October 1961, during the Algerian War (1954–62). Under orders from the head of the Parisian police, Maurice Papon, the French National Police attacked a demonstration by 30,000 pro-National Liberation Front (FLN) Algerians. After 37 years of denial and censorship of the press, in 1998 the French government finally acknowledged 40 deaths, while some historians estimate that between 200 and 300 Algerians died. Death was due to heavy-handed beating by the police, as well as mass drownings, as police officers threw demonstrators into the river Seine.

The massacre was intentional, as substantiated by historian Jean-Luc Einaudi, who won a trial against Papon in 1999 (Papon had been convicted in 1998 of crimes against humanity for his role under the Vichy collaborationist regime during World War II). Official documentation and eyewitness accounts within the Paris police department suggest that Papon directed the massacre himself. Police records show that he called for officers in one station to be "subversive" in quelling the demonstrations, and assured them protection from prosecution if they participated.Forty years after the massacre, on 17 October 2001, Bertrand Delanoë, the Socialist Mayor of Paris, put up a plaque in remembrance of the massacre on the Pont Saint-Michel. How many demonstrators were killed is still unclear. In the absence of official estimates, the plaque commemorating the massacre reads, "In memory of the many Algerians killed during the bloody repression of the peaceful demonstration of 17 October 1961". On 18 February 2007 (the day after Papon's death) calls were made for a Paris Métro station under construction in Gennevilliers to be named "17 Octobre 1961" in commemoration of the massacre.