Houston Roberts (1905 – March 21, 1951) was an American murderer and suspected serial killer who was convicted for poisoning his two granddaughters in 1949, one fatally, but later confessed that he was also responsible for killing two of his wives in 1931 and 1933. He was never prosecuted for the former murders, but was sentenced to death for his granddaughter's murder and subsequently executed in 1951, despite recanting his confession and claiming that he was innocent.