伊森·弗莱（Ethan Frye，约1825年 – 1868年）was a schoolmaster and a member of the British Brotherhood of Assassins during the Victorian era, as well as the husband of Cecily Frye and the father of twins Jacob and Evie.
In 1841, Ethan traveled to India, where he helped his fellow Assassin Arbaaz Mir fight William Sleeman and recover the Koh-i-Noor; the two Assassins becoming good friends in the process. In 1847, following the death of his wife in childbirth and blaming the newborn twins for his loss, a distraught Ethan returned to India to take up the training of Mir's son, Jayadeep. He left for England in 1853 when his time with Jayadeep influenced him into taking proper care of his children and mourn his wife's passing. Ethan raised the twins in the philosophy of the Creed, advising them to learn patience and to never let personal feelings get in the way of the mission. Evie took his words to heart, whereas Jacob merely wanted to drown them out.
In 1868, he died of pleurisy, some weeks before his children traveled to London.
- The name Ethan (איתן) is of Hebrew origins, meaning "firm", "strong" or "impetuous". Frye is a derivative of the English word free.