Sö 139 is a Viking Age runestone in granite inscribed in Old Norse with the Younger Futhark runic alphabet. It is located 3.5 m east-north-east of Sö 140 along the road between Lid and Aspa in Ludgo parish, in Nyköping Municipality, in Södermanland. Both stones are placed at the southern side of the road next to the brook at Korpbro.[1] It is 1.48 m tall and 1.36 m wide.[2] The style is tentatively categorized as Pr3. It is unusual because it was raised in memory of a woman.