Laine Mägi (born Laine Mihelson-Adamson; February 3, 1959) is an Estonian stage, film and television actress, dancer and choreographer and dance pedagogue who began her career as a teenager. She is the founder of the Laine Mägi School of Dance, based in Pärnu.

Laine Michelson-Adamson was born in Kehra to Peeter and Elli-Anniki Michelson-Adamson (née Pennie). She has one brother who is two years younger. Her first cousin is actress Terje Pennie-Kolberg. She became interested in ballet at an early age and began taking lessons at the Tallinn Ballet School at age nine, taking the train from Kehra to Tallinn. She made her debut at the Estonia Theatre at the age of ten in a stage production of Astrid Lindgren's Pippi Longstocking. She later had to abandon ballet classes in 1973 due to poor health. From 1976 until 1981, she performed as a dancer in various venues throughout Tallinn.