Catherine Karlsdotter, in Swedish called Katarina Karlsdotter and later Katarina Gumsehuvud (died 7 September 1450) was Queen of Sweden from 1448 to 1450 and Queen of Norway from 1449 to 1450 as the second wife of King Karl Knutsson.
Catherine was the daughter of the nobleman Karl Ormsson (Gumsehuvud).
Before their marriage, dispensation was obtained from the Pope, as Catherine was related to Karl's first wife.
This was to ensure that children born in the marriage would be regarded as legitimate.
Queen Catherine was described as beautiful and cheerful; she created a nice environment and a relaxed atmosphere at court, and she was forthcoming to those who came seeking audience.