Robert Langdon (born June 22, 1964 in Exeter, New Hampshire, United States) is a fictional professor of religious iconology and symbology at Harvard University who appeared in the Dan Brown novels Angels & Demons (2000) and The Da Vinci Code (2003). He is scheduled to be the lead character in an upcoming third novel entitled The Lost Symbol. Tom Hanks portrayed Robert Langdon in the 2006 film adaptation of The Da Vinci Code, and reprised the role in the 2009 film adaptation of Angels & Demons.

Little background detail is given by Brown about Robert Langdon. In The Da Vinci Code, he is described as looking like "Harrison Ford in Harris tweed". He was a diver at Phillips Exeter Academy in prep school and played water polo collegiately as well.

He suffers from claustrophobia, the fear of enclosed spaces, as he fell in a well when he was 7 years old. In the film adaptation of The Da Vinci Code, Professor Langdon has an eidetic memory and phenomenal problem-solving talents. Robert Langdon was named after John Langdon, a professor of typography at Drexel University who is known for his creation of ambigrams, typographical designs that can be read in multiple ways; for example, both right side up and upside down.

An example of Langdon's ambigrams appeared on the cover of the first edition of Brown’s novel Angels & Demons. The ambigrams featured throughout the novel were also designed by Langdon. On the acknowledgments page, Brown calls Langdon "one of the most ingenious and gifted artists alive … who rose brilliantly to my impossible challenge and created the ambigrams for this novel".

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