Lac du Monte Tignoso (Corsican: Lavu di u Monti Tignosu) is a small lake in the Monte Renoso massif in the Corse-du-Sud department of France.

The lake is in the Monte Incudine massif at an elevation of 1,235 metres (4,052 ft).

[1] It is in the commune of Figari, on the southeast flank of the Montagne de Cagna above the source of the Ruisseau de Vivaggio.

[2] It is a seasonal lake that is dry for much of the year.