Hyder can refer to:
- Hyder, Alaska, a town in the United States
- Hyder (defunct company), a former UK utility infrastructure company
- Hyder Consulting, a current infrastructure company, former subsidiary of Hyder
- the Arabic name Haydar (Arabic حيدر )
- Hyder Ali (c. 1722–1782), ruler of the Kingdom of Mysore
- Qurratulain Hyder (1928–2007), an Indian Urdu novelist and short story writer
- Hyderabad, a city in Andhra Pradesh, India
- Hyderabad, a city in Sindh, Pakistan