Rögnvaldsson is a surname. Notable people with the surname include:
Echmarcach Rognvaldsson (died 1064), dominant figure in the eleventh-century Irish Sea region Eiríkur Rögnvaldsson (born 1955), Icelandic linguist, professor of Icelandic at the University of Iceland Guðrøðr Rǫgnvaldsson (died 1231), AKA Guðrøðr Dond, ruler of the Kingdom of the Isles Hallad Rognvaldsson, Norse jarl ruling the archipelagos of Orkney and Shetland Jón Rögnvaldsson (died 1625), alleged Icelandic sorcerer Petur Rognvaldsson (1934–2007), Icelandic-born athlete and actor Robert Rognvaldsson (died between 928 and 933), Viking who became the first ruler of Normandy
See also Ronaldson