Britta Hasso (1936–2015) (also known as Britta Callmér-Hartnagel) was a Swedish actress and journalist.

She was mostly known for writing articles about school and pedagogic topics. Hasso studied to become an actress at Kalle Flygare's theatre school in Stockholm, Sweden in the 1950s and shortly after she started her career she met Harry Hasso (also known as Karl Hartnagel) the Swedish/German film director and camera man whom she married in 1961.

They remained married until his death in 1984. She started to work as a journalist at Helsingborgs Dagblad in Helsingborg, Sweden in 1966 and worked there until she retired in 1998. 

She died at age 79 on Valentine's Day 2015.