I'll Search My Heart and Other Great Hits is a compilation album by American pop singer Johnny Mathis that was released by Columbia Records in April 1964 and gathered up five A-sides that reached the Billboard Hot 100, a corresponding B-side, and six songs that had previously been unreleased. The album debuted on Billboard magazine's Top LPs chart the following month, in the issue dated May 9, and got as high as number 35 during its 16 weeks there.