Morgan William Crofton (1826, Dublin, Ireland – 1915, Brighton, England) was an Irish mathematician who contributed to the field of geometric probability theory.
He also worked with James Joseph Sylvester and contributed an article on probability to the 9th edition of the Encyclopædia Britannica.
Morgan Crofton was born into a wealthy Anglo-Irish family.
His father, the Reverend William Crofton, Rector of Skreen, County Sligo, was the younger brother of Sir Malby Crofton, 2nd Baronet of Longford House.
Despite being born into an aristocratic, Anglican family, Crofton joined to the Roman Catholic Church in the 1850s in part due to an interest in Cardinal John Henry Newman.