Bloody Thursday, Thursday Massacre or Thursday Night Massacre may refer to:

• "Bloody Thursday", on March 28, 1918, during the Battle of Tampere
• "Bloody Thursday" on July 5, 1934, during the 1934 West Coast waterfront strike in the United States
• The Chiquola Mill Massacre, on September 6, 1934, during the 1934 textile workers' strike in the eastern United States
• The Kossuth Tér Massacre, on October 25, 1956, during the Hungarian Revolution
• The 2017 storming of the Macedonian Parliament, on April 27, 2017, was dubbed "Bloody Thursday".
• "Bloody Thursday", on May 15, 1969, during protests at People's Park in Berkeley, California
• "Bloody Thursday", on February 17, 2011, during the fourth day of the Bahraini uprising
• "Thursday Night Massacre", a name for the December 2022 Twitter suspensions

• Black Thursday (disambiguation)