Fyrby Runestone, Norse runestone in Blacksta socken, Sweden.

The Fyrby Runestone is a grey granite glacial boulder in Fyrby, Blacksta parish, about 15 km south of Flen. The boulder measures roughly three by three metres and stands two metres high; the carved band on its north face is 1.9 m high and 0.7 m wide, with runes 8–11 cm tall. The inscription, in runestone style RAK with straight band ends and no animal figures, begins with the pronoun "I".

Created between 990 and 1010, the stone was commissioned by two brothers, Hásteinn and Holmsteinn, to honor their father Freysteinn. This type of memorial shows how families in the Viking era preserved memories by carving them permanently into stone.

The inscription speaks of Midgard, the human realm in Norse mythology, and highlights the brothers' exceptional skill as rune carvers. Visitors can see this craftsmanship reflected in the intricate work preserved on the stone surface.

The runestone stands in Fyrby, about 15 km south of Flen in Blacksta socken. The carving faces north on a granite boulder measuring three by three metres and two metres high; the carved band itself is 1.9 m tall and 0.7 m wide, with rune heights of 8–11 cm. About 20 m southwest are 4–5 pits that may be damaged ancient remains.

The inscription opens with the pronoun "I", which may mean the stone itself speaks to the reader. It also names Midgard, the world of humans in Norse cosmology, and calls the brothers the most skilled rune-carvers there.