Despite many jokes to the contrary, a humanitarian is not someone who eats humans (as a vegetarian eats vegetables)! A humanitarian is a person concerned with the welfare of all mankind.

A millionaire would be considered a great humanitarian if he donated much of his wealth for improving education, housing, and food for the poor. As an adjective, humanitarian is used to describe something or someone who displays the characteristics of someone concerned with human welfare: "The humanitarian project was developed to help women become self-sufficient in third world countries."

Definitions of humanitarian

adj marked by humanistic values and devotion to human welfare

“released the prisoner for humanitarian reasons”
human-centered, human-centred, humanist, humanistic
marked or motivated by concern with the alleviation of suffering

adj of or relating to or characteristic of humanitarianism

humanitarian aid”

n someone devoted to the promotion of human welfare and to social reforms

do-gooder, improver
Type of:
benefactor, helper
a person who helps people or institutions (especially with financial help)

n an advocate of the principles of humanism; someone concerned with the interests and welfare of humans

Type of:
advocate, advocator, exponent, proponent
a person who pleads for a cause or propounds an idea