Dan Brown is an American author of thriller fiction, best known for the 2003 bestselling novel, The Da Vinci Code. Brown's novels, which are treasure hunts set in a 24-hour time period, feature the recurring themes of cryptography, keys, symbols, codes, and conspiracy theories. His books have been translated into over 40 languages, and as of 2009, sold over 80 million copies.

Brown's novels that feature the lead character Robert Langdon also include historical themes and Christianity as recurring motifs, and as a result, have generated controversy. Brown states on his website that his books are not anti-Christian, though he is on a "constant spiritual journey" himself, and says of his book The Da Vinci Code that it is simply "an entertaining story that promotes spiritual discussion and debate" and suggests that the book may be used "as a positive catalyst for introspection and exploration of our faith."

His notable works include Angels & Demons (2000), The Da Vinci Code (2003), The Lost Symbol (2009), Inferno (2013), and Origin (2017). His novels have been translated into 57 languages and, as of 2012, have sold over 200 million copies. Three of them, Angels & Demons, The Da Vinci Code, and Inferno, have been adapted into films, while The Lost Symbol was adapted into a television series.