To Kill a Mockingbird is a novel by Harper Lee published in 1960. Instantly successful, widely read in high schools and middle schools in the United States, it has become a classic of modern American literature, winning the Pulitzer Prize. The plot and characters are loosely based on Lee's observations of her family, her neighbors and an event that occurred near her hometown of Monroeville, Alabama, in 1936, when she was ten.

Despite dealing with the serious issues of rape and racial inequality, the novel is renowned for its warmth and humor. Atticus Finch, the narrator's father, has served as a moral hero for many readers and as a model of integrity for lawyers. The historian J. Crespino explains, "In the twentieth century, To Kill a Mockingbird is probably the most widely read book dealing with race in America, and its main character, Atticus Finch, the most enduring fictional image of racial heroism."

As a Southern Gothic and Bildungsroman novel, the primary themes of To Kill a Mockingbird involve racial injustice and the destruction of innocence. Scholars have noted that Lee also addresses issues of class, courage, compassion, and gender roles in the Deep South. The book is widely taught in schools in the United States with lessons that emphasize tolerance and decry prejudice. Despite its themes, To Kill a Mockingbird has been subject to campaigns for removal from public classrooms, often challenged for its use of racial epithets.