John Louis Emil Dreyer, also Johan Ludvig Emil Dreyer, was a Danish astronomer who spent most of his career working in Ireland. He spent the last decade of his life in Oxford, England.
- Occupation
- astronomer, biographer
- Position held
- President of the Royal Astronomical Society
- Citizenship
- Kingdom of Denmark, Ireland, United Kingdom
- Born
- February 13, 1852
- Died
- September 14, 1926
