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The Robert Langdon novel series is named after Robert Langdon, the protagonist of the novels by American author Dan Brown. Langdon is portrayed as a Harvard University professor of religious iconology and symbology, a fictional field related to the study of historic symbols, which is not methodologically connected to the actual discipline of semiotics. Brown's novels that feature the lead character also include historical themes and Christianity as motifs, and as a result have generated controversy. Brown states on his website that his novels are not anti-Christian, and that he is on a "constant spiritual journey" himself.

The series has sold over 120 million copies.

The novels were a success around the world and became bestsellers, and soon adapted into films in which Ron Howard directed and produced 3 of 6 novels: The Da Vinci Code (2006), Angels & Demons (2009), and Inferno (2016), with Tom Hanks portraying the lead character, Professor Robert Langdon. All three were released by Columbia Pictures.

The novel The Lost Symbol was adapted in 2021 by Peacock with Ashley Zukerman playing the lead character, Professor Robert Langdon. The series has 1 season containing 10 episodes. In January 2022, Peacock canceled the show after only 1 season, which will continue to be available for streaming.

It was announced in May 2025 that Netflix had picked up an adaptation of the upcoming novel The Secret of Secrets with a straight-to-series order with Brown and Carlton Cuse as producers. Morgan Spector has been cast as Langdon.