Nidau District
Nidau District is one of the 26 administrative districts in the canton of Bern, Switzerland. Its capital, while having administrative power, was the municipality of Nidau.
From 1 January 2010, the district lost its administrative power while being replaced by the Biel/Bienne (administrative district), whose administrative centre is Biel/Bienne.
Since 2010, it remains therefore a fully recognised district under the law and the Constitution of the Canton of Berne.
Although the district is officially German speaking, a small French-speaking minority lives in the area. The district has an area of 113 km2 and consisted of 25 municipalities:
| Municipality | Population | Area |
| Aegerten | 1,656 | 2.1 |
| Bellmund | 1,371 | 3.8 |
| Brügg | 3,962 | 5.0 |
| Bühl bei Aarberg | 421 | 3.0 |
| Epsach | 343 | 3.4 |
| Hagneck | 418 | 1.8 |
| Hermrigen | 264 | 3.5 |
| Ipsach | 3,747 | 1.9 |
| Jens | 648 | 4.6 |
| Ligerz | 507 | 1.8 |
| Merzligen | 404 | 2.3 |
| Mörigen | 841 | 2.2 |
| Nidau | 6,652 | 1.5 |
| Orpund | 2,620 | 4.0 |
| Port | 3,206 | 2.5 |
| Safnern | 1,839 | 5.6 |
| Scheuren | 452 | 2.1 |
| Schwadernau | 623 | 4.1 |
| Studen | 2,642 | 2.7 |
| Sutz-Lattrigen | 1,303 | 3.6 |
| Täuffelen | 2,523 | 4.4 |
| Tüscherz-Alfermée | 309 | 3.3 |
| Twann | 818 | 9.1 |
| Walperswil | 890 | 7.0 |
| Worben | 2,269 | 2.8 |