William Joseph Mackey (1915 in Montreal, Canada - October 18, 1995 in Thimphu, Bhutan) was a Canadian Jesuit priest who was responsible for establishing the modern education system in Bhutan, including its first high school (which is now its first accredited university, Sherubtse College).
Mackey joined the Jesuits in 1932, and was ordained priest in 1945. In 1946, he left Canada for the Jesuit mission in Darjeeling district of India. He served there for 17 years, during which time he participated in many education programs and was headmaster of two high schools. However, he also became unpopular with local authorities, and in 1963 he was ordered to leave the country.
When the King of Bhutan, Jigme Dorji Wangchuck, learned of Mackey's imminent expulsion from India, he invited Mackey to become an educator in Bhutan, as part of that country's ongoing modernization efforts. Mackey accepted the invitation. As a preemptive measure, he had all his teeth removed, because he would have no access to modern dentistry in Bhutan.
When Mackey arrived in Bhutan in October 1963, the Jesuits became the first Roman Catholic religious order allowed in the officially-Buddhist nation. During the three decades that followed, Mackey performed no conversions of Bhutanese citizens, as that was forbidden under Bhutanese law.