Terrestrials is a collaborative studio album by American drone metal band Sunn O))) and Norwegian experimental music group Ulver.

[8] Sunn O))) was invited to perform at the Øya festival in Oslo, at which time Rygg proposed that the band remain in the country for several additional days in order to collaborate.

[8]As O'Malley explained of the three "live improvisation pieces" comprising the album, "I remember the vibe in the room back then was more rāga than it was rock.

[15] Writing for Allmusic, Thom Jurek lauded the album, as "it perfectly reflects both Sunn O)))'s impenetrably emotional dark heart and Ulver's expertly crafted senses of drama and dynamic".

[1] Grayson Currin of Pitchfork also indicated that the impact of the songs proved fleeting: "After the sun rises on these meditations, then, you can simply go about your daily routine, somewhat elevated but mostly unaltered".