A Taiwanese man carried out a stabbing spree on a Taipei Metro train, killing four people and injuring 24 others.

On 21 May 2014, a Taiwanese man carried out a stabbing spree targeting random civilians on a Taipei Metro C321 train near Jiangzicui Station, resulting in four deaths and 24 injuries. It was the first fatal attack on the city's subway system since operations began in 1996. The attacker, 21-year-old Cheng Chieh, was arrested after the attack. He was sentenced to death, in addition to 144 years in prison, and was executed on 10 May 2016.

Taipei Metro is a rapid transit system operated by the Taipei Rapid Transit Corporation serving the capital Taipei and New Taipei City in Taiwan.