Edward Castres Gwynne (13 February 1811 – 10 June 1888) was an English-born Australian lawyer, Supreme Court of South Australia judge and politician.

[1][2] In 1851 he was nominated to the South Australian Legislative Council,[3] and soon afterwards brought in a bill to establish state aid to religion, which was however defeated.

From December 1872 to June 1873 he was acting chief justice, and in February 1877 received extended leave of absence to visit England.

[1] In retirement Gwynne grew oranges on a comparatively large scale, and also gave some attention to viticulture; he also bred horses.

As a lawyer he was a good pleader, and as a judge he was distinguished for his clearness of apprehension, breadth of view, strict impartiality, and excellent knowledge of the law.