Longeau
Longeau means:
- Longeau-Percey , a commune in the Haute-Marne department in France
- Canton Longeau-Percey in the French department of Haute-Marne
- Longeau (Yron) , river in France (Lorraine), tributary of the Yron
- the French name of the municipality of Lengnau in the canton of Bern, Switzerland
- a district of the Belgian municipality of Messancy