The Granby Runestone (Swedish: Granbyhällen), designated as U 337 under the Rundata catalog, is one of the longest Viking Age runic inscriptions located in Uppland, Sweden.

The Granby Runestone has a runic inscription carved on a boulder consisting of a memorial to a father, a mother and some other people.

[1] The runic text states that the inscription was carved by the runemaster Visäte, who was active in Uppland during the last half of the eleventh century.

There are seven other runestones signed by Visäte in Uppland, including U 74 in Husby, U 208 in Råcksta, U 236 in Lindö, U 454 in Kumla, U 669 in Kålsta, U 862 in Säva, and U Fv1946;258 in Fällbro.

The animal heads are typically seen in profile with slender almond-shaped eyes and upwardly curled appendages on the noses and the necks.