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 Olympics
Bror-Erik Wallenius (born 1943), Finnish sports commentator who works for Finland's National Broadcasting Company Yle
Kurt Martti Wallenius (1893–1984), Finnish Major General
Olof Wallenius (1902–1970), Swedish entrepreneur and the founder of Wallenius Lines
Ville Wallenius, Finnish guitarist who plays in the power metal band Twilightning
