Rannu is a small borough in Tartu County, Estonia. It is the administrative centre of Rannu Parish.
Rannu may refer to several places:
- Rannu, Uttar Pradesh, village in Uttar Pradesh, India
- Rannu Parish, municipality in Tartu County
- Rannu, small borough in Rannu Parish, Tartu County
- Rannu, Ida-Viru County, village in Aseri Parish, Ida-Viru County
- Rannu, Lääne County, village in Lihula Parish, Lääne County