Killing Mr. Griffin is a 1978 suspense novel by Lois Duncan about a group of teenaged students at a New Mexico high school, who plan to kidnap their strict English teacher, Mr. Griffin. Duncan developed the story from the character of Mark, who is involved in the kidnapping plan and is based on the first boyfriend of Duncan's oldest daughter. Mr. Griffin was based on the personality of a teacher one of Duncan's daughters had in high school. In 2010, the novel was reissued with changes to modernize the content.