The Tyrrhenian Sea (; Italian: Mar Tirreno in Italian pronounced as /mar tirˈrɛːno/, French: Mer Tyrrhénienne in French pronounced as /mɛʁ tiʁenjɛn/, Sardinian: Mare Tirrenu, Corsican: Mari Tirrenu, Sicilian: Mari Tirrenu, Neapolitan: Mare Tirreno) is part of the Mediterranean Sea off the western coast of Italy.
Ti Baybay Tirreno (/tɨˈriːniən ˈsiː/; Korso : Mari Tirrenu, Pranses: Mer Tyrrhénienne [mɛʁ tiʁenjɛn], Italiano: Mar Tirreno [mar tirˈrɛːno], Napolitano: Mar Tirreno, Sardo: Mare Tirrenu, Siciliano: Mari Tirrenu) ket parte ti Baybay Mediteraneo idiay akinlaud nga aplaya ti Italia.