TT-Line is a shipping company based in Travemünde Germany, which has been providing a ferry services between Travemünde, Germany and Trelleborg, Sweden since 1962. In 1992 a new route from Rostock to Trelleborg was opened. Until 1997 this new service was marketed as TR-Line.
In 1978 TT-Line acquired a 50% interest in Olau Line, the remaining shares of the company were acquired in 1979. TT-Line remained the sole owner of Olau Line until the line’s eventual closure in 1994.