James Millar FRSE FRCPE (1762–1827) was a Scottish physician, natural scientist and author. He edited the fourth and fifth editions of the Encyclopædia Britannica.
Although a good writer on scientific topics, he was deemed a poor chief editor of the Britannica, being "slow and dilatory and not well qualified".
Born at Ayr 4 February 1762, he studied classics and science at Glasgow University. For some years he acted as tutor in Jamaica, and then was chaplain at Glasgow university. Moving to Edinburgh, he graduated M.D. and became fellow of the Royal College of Physicians of Edinburgh. He frequently lectured on natural history and chemistry, and was one of the physicians at the Edinburgh Dispensary, where he caught a fever and died 13 July 1827. He left a family.
In 1807 Millar published with William Vazie Observations on the Advantages and Practicability of making Tunnels under Navigable Rivers, particularly applicable to the proposed Tunnel under the Forth, Edinburgh. This work related to a plan for a tunnel from Rosyth to Queensferry, also involving John Grieve. Robert Bald was consulted, but the project came to nothing.
Millar also edited the fourth edition of the Encyclopædia Britannica, 20 vols., Edinburgh, 1810, and the last fifteen volumes of the fifth edition of the same work, 20 vols., Edinburgh, 1817; he contributed largely to both editions. Millar also planned and edited a more popular dictionary of arts, sciences, and literature, the Encyclopædia Edinensis, 6 vols., Edinburgh, 1827.
Other publications, mainly based on articles already contributed to encyclopædias, included: