'The Sickness' was the debut studio album by heavy metal band Disturbed. First released on March 7, 2000, the album peaked at number 29 on the Billboard 200 chart.

Unlike Disturbed's later albums, which are mixed in style, 'The Sickness' consists primarily of heavier songs. In addition, The Sickness includes much more profanity, darker lyrical themes, and more electronic elements than later Disturbed albums.