Princess Märtha of Sweden (28 March 1901 – 5 April 1954), full name Märtha Sofia Lovisa Dagmar Thyra was the granddaughter of King Oscar II of Sweden and the consort of Crown Prince Olav of Norway (later King Olav V). She was the first Crown Princess of Norway in modern times who was not also Crown Princess of Sweden or Denmark. She was also a Princess of Norway from her birth in 1901 to the dissolution of the personal union between Sweden and Norway in 1905.