Sadan may refer to:
- Sədan, a village and municipality in Azerbaijan
- Sadan, Iran, a village in Golestan Province, Iran
- Sadan, South Khorasan, a village in South Khorasan Province, Iran
- Sadan peoples, Indo-Aryan ethnic groups in India
- Sadanic languages, languages of these people
- Nagpuria people or Sadan, ethnic group of Jharkhand, India
- Sadani or Sadri language, Indo-Aryan language spoken by the ethnic group