Alf Tomas Jonsson (born 12 April 1960) is a former ice hockey player from Sweden.

He is assistant coach for the Danish national ice hockey team.

During the 1980 World Junior Championships he and Reijo Ruotsalainen were the media's selections as the best defencemen of the tournament.

Jonsson played with the Islanders until 1989, when he was traded to the Edmonton Oilers.

That made him one of the first three members of the Triple Gold Club, players who have won a Stanley Cup, a World Championship and an Olympic gold medal.