Marta has three siblings, José, Valdir, and Angela. Her parents are Aldário and Tereza. Her father left the family while Marta was a baby. As of 2010, she lives in San Jose. On 11 October 2010, Marta was named a UN goodwill ambassador. Marta is fluent in Portuguese, Swedish and English. She is a Catholic and states that God is very important to her, although she does not go to church often. In 2016, she was listed as one of BBC's 100 Women.