What is Gregory House’s middle name in House M.D.?
Answer
Gregory is his first name; no middle name is given
House M.D. does not give Gregory House a canonical middle name; Gregory is his first name and House is his surname.
The character is formally identified as Dr. Gregory House, and the series consistently uses “Gregory” as his given name. His professional title and surname are so prominent that viewers sometimes assume a middle name must appear in official character descriptions, but the show does not establish one.
This is a deliberately precise character-trivia distinction: a missing middle name is different from a hidden or commonly abbreviated one. House is also frequently called simply “House” by colleagues, while close friends such as Wilson sometimes use “Greg.” Those forms are nicknames or surname-based address, not evidence of an additional canonical name.