Sif Ruud was born in an well-off family, but when her stepfather had spent all of her mother's money, conditions for the family became more modest. A friend of her mother's was told about young Sif's interest in acting and gave her acting lessons. In 1934 she began her studies at the Royal Dramatic Theatre's acting school in Stockholm. One of her fellow students was 'Gunn Wållgren' .
Has said in an interview that her problems with dyslexia has helped her in her job, for because of them she has to read the scripts very carefully.
