Adinath or Adi natha is a Sanskrit word meaning "First Lord" and can refer to:
- Adi Jina, or Adinatha a title of the Lord Rishabha
- Rishabha, the first Tirthankar of Jainism
- Adi Nath, a title of the Hindu deity Shiva (sometimes used)
- Adinath Sampradaya, a sadhu sub-sect of the Nath Sampradaya