The 1991 Swedish Open was a men's tennis tournament played on outdoor clay courts in Båstad, Sweden that was part of the World Series of the 1991 ATP Tour.

It was the 44th edition of the tournament and was held from 8 July until 14 July 1991.

Second-seeded Magnus Gustafsson won the singles title.

[3] Magnus Gustafsson defeated Alberto Mancini, 6–1, 6–2 Ronnie Båthman / Rikard Bergh defeated Magnus Gustafsson / Anders Järryd, 6–4, 6–4