Dag Bengt Wennlund (born October 6, 1963, in Mariestad, Västra Götaland) is a retired javelin thrower from Sweden, who represented his native country at three consecutive Summer Olympics (1988, 1992 and 1996).
He is a three-time Swedish champion in the men's javelin event (1985, 1986 and 1991).
His personal best is 85.02, thrown on May 28, 1995 in Alvesta.