Jesse Harding Pomeroy (/ˈpɒmərɔɪ/; November 29, 1859 – September 29, 1932) was a convicted American murderer and the youngest person in the history of the Commonwealth of Massachusetts to be convicted of murder in the first degree. He was found guilty by a jury trial held in the Supreme Judicial Court of Suffolk County in December 1874. He was also a suspected serial killer.