Elisabeth Gunilla Andreassen (born March 28, 1958 in Gothenburg, Sweden by Norwegian parents) - also known as just "Bettan" - is a Swedish-Norwegian singer who has finished both first and second in the Eurovision Song Contest.

Andreassen is active in many musical genres, as country music, schlager and musicals. She is mostly famous from Eurovision Song Contest 1985 when she and Hanne Krogh participated as Bobbysocks with the song La det swinge, and won. She lives in Ullern, Oslo in Norway with her husband Tor and two daughters, born in 1995 and 1997. Elisabeth and Tor married on July 2, 1994, and before that Elisabeth was known as Elisabeth Andreasson.

Her talent was discovered in 1979 by Swedish musician and TV host Lasse Holm. She was produced by Bert Karlsson's label Mariann Grammofon AB. In 1980, she joined Lasse's group Chips. Chips participated in the Eurovision Song Contest 1982 with the song Dag efter dag (Day after Day), and reached 8th place.

Elisabeth Andreassen is an artist in many genres. She has sung country, pop, rock, ballads and opera. She plays three instruments; guitar, piano and contrabass. She has also been a revue and musical artist.

"Bettan" has a record as the woman with the most participations in the Eurovision Song Contest, tied with Lys Assia. She has participated four times, three times in duets (with Kikki Danielsson in 1982, Hanne Krogh in 1985, and Jan Werner Danielsen in 1994) and once on her own (in 1996).