Rognvaldr of Vedrafjordr (977-1 July 1035) was King of Vedrafjordr from 1022 to 1035, succeeding Sihtric mac Imair and preceding Ragnall ua Imair of Waterford. In 1035, King Sigtrygg Silkbeard of Dyflin captured Rognvaldr and had him executed in Dublin as part of a blood feud with Rognvaldr's father Ivar of Waterford.