Perlita Neilson (born Margaret Phillipa Sowden; 11 June 1933 – 7 April 2014) was an English film, stage and television actress. She was educated at the Aida Foster Theatre School.

One of her most notable roles was in 1957 as Anne Frank in the London production of The Diary of Anne Frank. She was born Margaret Phillipa Sowden in Bradford, but spent her early life in Argentina, where her father, Wilson Sowden, worked as an engineer. After her birth, her mother Isabella (née Gibson) returned to Buenos Aires, where Margaret attended stage school.