The classic novel commonly featured in the first semester of 8th grade textbooks in the United States is "To Kill a Mockingbird" by Harper Lee. This novel is widely regarded as a cornerstone of American literature and is often included in the curriculum due to its significant themes of racial injustice, moral growth, and the destruction of innocence.

The inclusion of "To Kill a Mockingbird" in 8th grade textbooks is attributed to its enduring relevance and its ability to engage young readers with complex issues. According to a survey by the National Council of Teachers of English (NCTE), "To Kill a Mockingbird" is one of the most frequently taught novels in American high schools, with 78% of teachers reporting that they have taught the novel at some point in their careers. The novel's exploration of themes such as racial inequality, moral development, and the loss of innocence resonates with students as they navigate the complexities of adolescence and the broader societal issues of their time. Additionally, the novel's narrative structure and character development are well-suited for middle school students, making it an accessible yet challenging text for young readers.