Robert Blair (1748–1828) was a Scottish astronomer.
Robert Blair was the first Regius Professor of Astronomy at the University of Edinburgh (1785). He invented the aplanatic lens and also coined this term. This was a significant step in reducing the aberration in optical systems. He also experimented with hollow lenses, holding different solutions.
- Jean Eisenstaedt, "Light and relativity, a previously Unknown Eighteenth-Century Manuscript by Robert Blair (1748–1828)", Annals of Science, 62 347-376 (2005).
- Jean Eisenstaedt, Avant Einstein Relativité, lumière, gravitation, Paris, Seuil (2005).