Mathilda (or Mathilde) Foy (or Foj), (10 November 1813 – 1 November 1869), was a Swedish philanthropist and writer, known for her charitable work.
She is known as a pioneer of the Sunday school, and as the co-founder of the charity organisation, Fruntimmersällskapet för fångars förbättring ('Women's Society for the Improvement of Prisoners') in 1854.