Sir Michael Francis O'Dwyer, (28 April 1864 – 13 March 1940), was an Irish Indian Civil Service (ICS) officer and later the Lieutenant Governor of Punjab, British India between 1913 and 1919, most commonly known for his role in administering martial law in Punjab, between April and June 1919.
It was during O'Dwyer's tenure as Punjab's Lieutenant Governor that the Jallianwala Bagh massacre occurred in Amritsar, on 13 April 1919.
As a result, his actions are considered one of the most significant factors in the rise of the Indian independence movement led by Mahatma Gandhi.
O'Dwyer endorsed Colonel Reginald Dyer's action regarding the Amritsar massacre and termed it a "correct action".
He was assassinated in 1940 by Udham Singh, an Indian revolutionary, in retaliation for the massacre.