Wallenius is a surname. Notable people with the surname include:
Asser Wallenius (1902–1971), Finnish speed skater and racing driver who competed in the 1924 Winter OlympicsBror-Erik Wallenius (born 1943), Finnish sports commentator who works for Finland's National Broadcasting Company YleKurt Martti Wallenius (1893–1984), Finnish Major GeneralOlof Wallenius (1902–1970), Swedish entrepreneur and the founder of Wallenius LinesVille Wallenius, Finnish guitarist who plays in the power metal band Twilightning