Trelleborg may refer to:
Viking ring castles, colloquially known as "Trelleborgs" Trelleborg (Slagelse), a Viking ring castle in Denmark Trelleborg, Sweden's southernmost city, the seat of Trelleborg Municipality, and location of a viking ring castle Trelleborg Municipality the southernmost municipality of Sweden Trelleborg Parish, a parish of the Church of Sweden Trelleborg AB, a Swedish company M/S Trelleborg, name of two ships built in 1958 and 1982