| Type: | commune |
| County: | Vrancea |
| Sihlea | |
| Leader Name: | Radu Modreanu |
| Leader Party: | Independent |
| Leader Term: | 2020 - 2024 |
| Coordinates: | 45.5°N 34°W |
| Elevation: | 105 |
| Area Total: | 88.24 |
| Population Total: | auto |
| Postal Code: | 627300 |
Sihlea is a commune located in Vrancea County, Romania. It is composed of four villages: Bogza, Căiata, Sihlea, and Voetin.
The commune is located in the southern extremity of the county, from the county capital, Focșani. Sihlea is situated on the border with Buzău County, only from Râmnicu Sărat. It lies on the left bank of the river Coțatcu and on both banks of its tributary, the Slimnic.
Sihlea is crossed by the county road DJ202E, which connects it to the west with Obrejița (where it intersects with national road DN2) and further to Tâmboești, and to the south to Râmnicelu. In the north, it is also crossed by the national road, which connects it to the east with Tătăranu (where it ends in) and to the west with Dumbrăveni (where it intersects with the same DN2), Bordești, Dumitrești, Chiojdeni, and Jitia. The partly built A7 motorway, which starts in Ploiești in the direction of Buzău, will enter Vrancea County in Sihlia, continuing north towards Focșani and ending in Siret.[1]
Train stations in Voetin and Sihlea villages serve the CFR Main Line 500, which connects Bucharest with the Ukrainian border near Chernivtsi.
According to the 2011 census, the commune had a population of 5,039, of which 90% were ethnic Romanians and 5.9% were Roma.