Edward Castres Gwynne (13 February 1811 â 10 June 1888) was an English-born Australian lawyer, Supreme Court of South Australia judge and politician.
Gwynne was born at Lewes, Sussex, England.
At the end of 1837 Gwynne was appointed clerk of court by the Supreme Court of South Australia judge John Jeffcott. Gwynne left for South Australia, arriving in Adelaide aboard the Lord Goderich on 15 April 1838. His appointment as clerk of court was not confirmed.
Gwynne died on 10 June 1888. Mount Gwynne in the Northern Territory was named after Gwynne by John McDouall Stuart in 1860.
He married Marian (a daughter of Richard Eales Borrow) who survived him with four sons and four daughters.
His nephew Aubrey Percival Gwynne was a member of the Elder Scientific Exploring Expedition of 1891-1892.