Mr. Smith is a fictional character in the Hey Arnold! TV Series.
Mr. Smith is a very private person; he has his meals sent up to his room, has his own bathroom (for which he pays extra — "Door Number 16"), and avoids virtually all contact with the others, including Arnold, who has to collect the rent through a vault hidden in the floor ("Gerald Comes Over"). He lives in the boarding house for three years already but he still has never said a word to anybody. It's implied that he's a government agent when Arnold and Gerald visit the place he works at. Mr. Smith is not even mentioned in the second season; according to Craig Bartlett, he moved out.
His name is a reference to Alfred Hitchcock's 1941 movie "Mr. & Mrs. Smith."
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