Janet Penrose Trevelyan, CH (née Ward; 6 November 1879 – 7 September 1956) was a British writer, social campaigner, and fundraiser.

Trevelyan was born Janet Penrose Ward in Oxford on 6 November 1879.

[1] Educated at home, and without attending university, Trevelyan translated Adolf Jülicher's Introduction to the New Testament, and Wilhelm Bousset's Life of Jesus in the early 1900s.

[3] Trevelyan also had a special interest in Italy: she authored several books on the country, and was instrumental in the establishment and survival of the British Institute of Florence, to which she served as Honorary Secretary from 1920 to 1946.

[4] On 19 March 1904, she married historian George Macaulay Trevelyan and they had two sons and a daughter together.