Sir John Prescott Hewett, GCSI, KBE, CIE, GCStJ (25 August 1854 – 27 September 1941) was a British Indian civil servant who served as Lieutenant Governor of the United Provinces of Agra and Oudh and later as a Conservative MP for Luton.

John Hewett, vicar of Babbacombe, Torquay, and his wife, Anna Louisa Lyster, daughter of Captain William Hammon and Mary Bellingham.

He was posted lieutenant governor of the United Provinces of Agra and Oudh in the same year and helped develop industry in the region.

He was keen on vocational education and obtained funds for establishing an agricultural college in Kanpur and organized a trade exhibition in 1910.

In 1911 he was relieved from his position as governor and sent to Delhi to organize the coronation durbar of King George V and Queen Mary.