Ragnhild Grågås (died 1510) was a 15th century resident of Stockholm, Sweden.
On 23 June 1477, she and her daughter were accused by Sigrid, the wife of Jens Bok, of having had sexual intercourse with her husband.
This was regarded as indirect incest according to contemporary law and was a serious crime punishable by death.
The court, however, dismissed the charges, as Grågås and her daughter had already previously been accused of the same crime, and already been acquitted of it.
The case against Grågås apparently attracted a lot of attention in contemporary Stockholm, and the location was already called Gåsgränd prior her death.