Sir Travers Twiss QC FRS (19 March 1809 in London – 14 January 1897 in London) was an English jurist.
He had a distinguished academic and legal career culminating in his appointment as Queen's Advocate-General.
Twiss was particularly noted for his contribution to the theory of international law.
He was widely consulted, and was asked to draw up the constitution of the Congo Free State.
A prolific author, Twiss wrote many influential textbooks on legal matters.
His public career came to a sudden end in 1872 after a scandal involving his wife Marie.
He continued to research and publish on aspects of international law.