Cornetu may refer to the following places in Romania:
- Cornetu, a commune in Ilfov County
- Cornetu, a village in Șimnicu de Sus Commune, Dolj County
- Cornetu, a village in Căpreni Commune, Gorj County
- Cornetu, a village in Vaideeni Commune, Vâlcea County
- Cornetu, a village in Slobozia Bradului Commune, Vrancea County
- Cornetu River