The Sickness unto Death is an 1849 book by Søren Kierkegaard

The Sickness unto Death may also refer to:

Sickness Unto Death (manga), a 2009 Japanese comic series Sickness unto Death, a 1976 instrumental work by Tomasz Sikorski "Sickness unto Death", a song from the 2010 album Hunger and Thirst by Typhoon "The sickness unto death, and then...", an English translation of the Japanese title of the 1996 Neon Genesis Evangelion episode "Splitting of the Breast"