Carin or Karin (Catharina) Du Rietz (1766–1788) was a Swedish woman who became a soldier at the Royal guard in the guise of a man.
The daughter of lieutenant Carl Du Rietz and Eva Cronhjelm, she was described as a woman with the stunning intelligence of an Amazon, with power and courage, temperament and beauty, and a "mind of fire".
The 18 May 1780 an incident was reported in the newspaper as a warning example; As a great benefit to the maids of the city, death newly discovered a terrible fraud, which, if it becomes an example, would alarm the fair sex, humiliate the clothing of males and make medical examinations necessary for both engagements and weddings.
One of the coachmen of the city of Linköping, Petter Cederlöf, had suddenly taken ill and died within ten hours.
The fiancée was initially devastated over the death of her dear "Petter", but when she was told, it was reported that: All her tears have suddenly ceased.