What was the name of the character played by William Christopher on M*A*S*H?

The character played by William Christopher on M*A*S*H was Father Francis Mulcahy. He portrayed the Catholic chaplain assigned to the 4077th Mobile Army Surgical Hospital, where his religious convictions were balanced by compassion, humor, and practical concern for the wounded soldiers and medical staff.

The character’s full name is presented with some variation across M*A*S*H material, including Father John Mulcahy and Father Francis John Patrick Mulcahy. “Father Francis Mulcahy” is therefore a fair and recognizable answer to the question, especially because Christopher’s performance made the character one of the show’s most memorable supporting figures.

Christopher joined the television series after George Morgan played Mulcahy in the pilot. He remained with M*A*S*H through its entire 1972–1983 run and continued the role in the short-lived spin-off AfterMASH. René Auberjonois played Mulcahy in the 1970 film, while Christopher played him on television.