Sideshow Symphonies is the fourth studio album by the Norwegian avant-garde metal band Arcturus. It was released on 19 September 2005. It is the first to feature Simen "ICS Vortex" Hestnæs as the principal vocalist and as second guitarist, as well as the first Arcturus album released by Season of Mist. It marks yet another change in Arcturus' sound, with a cold, dreamy aesthetic featuring relatively quiet guitars, more prominent vocals, and a slightly reduced use of synthesizers.