Ramsay Heatley Traquair FRSE FRS (30 July 1840 – 22 November 1912) was a Scottish naturalist and palaeontologist who became a leading expert on fossil fish.
Traquair trained as a medical doctor, but his thesis was on aspects of fish anatomy. He held posts as Professor of Natural History and Professor of Zoology in England and Ireland, before returning to his native Edinburgh to take up a post at the Museum of Science and Art. He spent the remainder of his career at the Museum building up a renowned collection of fossil fish over a period of more than three decades.
He published extensively on palaeoichthyology, authoring many papers and a series of monographs. His studies of rocks and fossils in Scotland overturned earlier work on fossil fish, establishing new taxonomic classifications. His honours included fellowships from a range of learned societies, including the Royal Society of Edinburgh, the Royal Society of London, and the Geological Society of London. Among his awards for his work on fossil fish are the Lyell Medal and the Royal Medal.