She was born 20 January 1993 in Paris and is the daughter of The Pianist director Roman Polanski and actress Emmanuelle Seigner. She also has a younger brother named Elvis.
Polanski was educated at the International School of Paris. She later studied acting at the Drama Centre London and the Central School of Speech and Drama, graduating in 2014.
Morgane started her acting career with a appearance as a girl on The Pianist (2002) at the age of 9, which was nominated for an Acadamy award for best picture.
She has also appeared in two more of her fathers films Oliver Twist (2005) and The Ghost Writer (2010).
In 2015, Polanski appeared on the British independent film Unhallowed Ground.