Nilgiri, which literally means "Blue Mountain" in many languages, may refer to:
- Nilgiri mountains, a range of mountains spanning the states of Tamil Nadu and Kerala in Southern India
- Nilagiri or Nilgiri, a town in Balasore District of the state of Orissa in East India
- The Nilgiris District, a region of the Indian state of Tamil Nadu
- Nilgiri tea, a dark intensely aromatic and flavourful tea grown around the Nilgiris in Tamil Nadu and Kerala in Southern India
- Nilgiris (supermarket), supermarket chain in South India
- Nilgiri Himal, a range of three peaks in the Annapurna region in Nepal.