Maria Laura Mainetti (born Teresina Elsa Mainetti; 20 August 1939 – 6 June 2000) was an Italian Catholic sister from the Sisters of the Cross institute. Mother superior of a convent in Chiavenna that specialised in helping juvenile delinquents, she was stabbed to death in a satanic sacrifice by three teenage girls on the night of 6 June 2000. Mainetti's death was declared a martyrdom by the Congregation for the Causes of Saints in 2020, and she was beatified on 6 June 2021, the twenty-first anniversary of her murder.