Björn Ulvaeus (born April 25, 1945) is a Swedish musician and composer, most notable as a member of ABBA.
Ulvaeus was born in Gothenburg, Sweden, but as a child he moved with his family to Västervik. After being a member of ABBA he has, together with Benny Andersson, created the musicals Chess, Kristina från Duvemåla (based on the Immigrant novels by Swedish writer Vilhelm Moberg), and Mamma Mia! (based on existing ABBA songs).
On July 6, 1971, Björn married Agnetha Fältskog; the marriage resulted in two children Linda (born in 1973), and Christian (born in 1977). In 1979, Björn and Agnetha divorced, although they both agreed to remain in ABBA. Björn later married Lena Kallersjö on January 6, 1981, and the marriage produced another two daughters.
Today he lives with his second wife in Stockholm. He is a co-owner of the Hotel Rival in Stockholm.