| Marta | |
| Mouth: | Tyrrhenian Sea |
| Mouth Coordinates: | 42.2352°N 11.6958°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Italy |
The Marta is an Italian river that flows into the Tyrrhenian Sea. Its source is Lake Bolsena near Marta.[1] It flows past Tuscania and is joined by a tributary that flows from the Cimini Hills. It then flows past Tarquinia and enters the Tyrrhenian Sea near Lido di Tarquinia.