Joan Lawrence (1921–1998) was an elderly Huntsville, Ontario woman who went missing in 1998. Her disappearance led the Ontario Provincial Police to discover that three other seniors—John Semple, 90, John Crofts, 71, and Ralph Grant, 70—were also missing, presumed murdered. Though Lawrence lived a solitary life, and was known locally as the "Cat Lady," she had previously worked as a poet and journalist, and was in the process of reporting her landlords for "frauds, theft, mistreatment and neglect" at the time of her disappearance.