William Fiddian Moulton (14 March 1835 – 5 February 1898) was an English Methodist minister, biblical scholar and educator.

William's father, James Moulton, was a Wesleyan Methodist minister and he had at least three other brothers, and probably two sisters.

Like his father and grandfather, William became a Wesleyan minister and in 1875 the first headmaster of The Leys School, Cambridge.

[1] On a stormy afternoon in 1898, he was on his way to visit a sick parishioner when he suffered a heart attack in the grounds of the school.

In his biography, his son James noted that "So genuine was his sense of unworthiness that praise to him became a positive pain.