| Type: | commune |
| County: | Tulcea |
| Casimcea | |
| Subdivisions: | Casimcea, Cișmeaua Nouă, Corugea, Haidar, Rahman, Războieni |
| Leader Name: | Gheorghe Țilincă[1] |
| Leader Party: | PNL |
| Leader Term: | 2020 - 2024 |
| Coordinates: | 44.7333°N 50°W |
| Elevation: | 138 |
| Elevation Min: | 87 |
| Elevation Max: | 300 |
| Area Total: | 204.47 |
| Population Total: | auto |
| Postal Code: | 827025 |
| Area Code: | +40 x40 |
Casimcea is a commune in Tulcea County, Northern Dobruja, Romania. It is composed of six villages: Casimcea, Cișmeaua Nouă (historical name: Ramazanchioi), Corugea, Haidar, Rahman, and Războieni (historical name: Alifacâ).
The commune also included the village of Stânca (historical name: Mahomencea), located at 44.75°N 28.2833°W, which is currently deserted.
The name of the commune is of Turkish origin, being derived from the word Kasım, itself from the Arabic Qasim, "one who distributes". The suffix "cea" is a Romanianization of the Turkish -ça.[2]
The commune is located in the southern part of the county, from the county seat, Tulcea, on the border with Constanța County. The river Casimcea has its source in Războieni village, at an altitude of, and flows southeast through Casimcea village, discharging in Lake Tașaul, close to the Black Sea coast. The river Topolog flows through Rahman village, discharging further south into the Danube.