Sissel Vera Pettersen (born January 28, 1977 in Oslo, Norway is a Norwegian jazz vocalist, saxophonist and composer, based in Copenhagen, Denmark. She is known for her extended and experimental vocal techniques, often mixed with the use of live electronic processing, and for her collaborations with artists such as Jon Balke, Theo Bleckmann, John Hollenbeck, Lionel Loueke, Chick Corea, Trondheim Jazz Orchestra, Trondheim Voices, Christian Wallumrød, Marc Ducret, Mats Gustafsson, Bo Stief, Marilyn Mazur, Terje Isungset, Nikolaj Hess, Mikkel Ploug and John Tchicai.
Pettersen's work also incorporates performance, theatre and visual art. She has collaborated with choreographers such as Kjersti Alveberg and Stuart Lynch and in a series of projects with Cirka Teater. She has exhibited paintings and graphic prints in Norway (Rana Kunstmuseum, Galleri Fenka) and Denmark (Galleri Arleth), and has made cover art for the German record label Winter & Winter.