Jainagar may refer to:
- Jainagar, Bihar, a town of the Madhubani district in the Indian state of Bihar.
- Jainagar, Maharashtra, a town of the Nandurbar district in the Indian state of Maharashtra.
- Jainagar, Koderma, a village in Jharkhand
- Jainagar (community development block), in the Koderma district in the Indian state of Jharkhand.
- Jainagar, Ramgarh, a census town , in Ramgarh district, Jharkhand
- Jai Nagarkatti, an American chemist and businessman who served as the president of the Sigma Aldrich.
- Barauni–Gorakhpur, Raxaul and Jainagar lines, a set of the three railway lines in the Indian Railways.
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