Presbyterian Christian School (PCS), is a private Christian school in Hattiesburg, Mississippi. It was originally founded as Bay Street Christian Day School in 1976. It serves preschool through grade 12. Grades K5-6 attend one campus, while 7-12 attend an adjacent campus.

The historian Joseph Crespino has noted that, unlike many other private schools in Mississippi, PCS was established after school desegregation began and enrolled minority students within a few years of its founding. Crespino's theory has been questioned, in light of the school's enrollment patterns compared to the general (at the time) enrollment patterns of white Southern families in private schools following desegregation.