At the Heart of Winter is the fifth album by Norwegian black metal band Immortal. It is the first Immortal album not to feature Demonaz on guitar, as he suffered from acute tendinitis in his hands. This is the first Immortal album not to feature a picture of the band on the cover, and the first to prominently feature the band's new logo. It also marks a shift in Immortal's musical sound, as it featured some experimentation with thrash metal. The album was also released as a strictly limited edition metal box, and a hand-numbered LP on Osmose Productions (later reissued in 2005).