Frögärd Ulvsdotter i Ösby (11th century) was a Swedish Norse woman. She was according to a common misconception believed to be a Viking Age female runemaster. This notion is based on Erik Brate's erroneous interpretation of runestone U 203. As early as 1943, Elias Wessén convincingly demonstrated that the sequence in question cannot be read as a carver's signature. Also, the place name uisby should be read Väsby rather than Ösby. Both U 194 and U 203 are carved by Åsmund Kåresson. An actual Swedish female Viking Age runemaster was Gunnborga.