Albert Cornelis "Appie" Baantjer (16 September 1923 – 29 August 2010) was a Dutch author of detective fiction and police officer.

Baantjer is mostly known for his commercially successful detective series surrounding police inspector De Cock and his assistant, sergeant Vledder.

One of his most noteworthy cases in the 1950s was the Moord op Magere Josje [nl], for which he was lead detective and which received wide media attention.

[4][5] In 1959, Baantjer, now working as a detective, and his head inspector Maurice van Dijk wrote a book titled 5x8... grijpt in.

[6] Baantjer is mainly known for his large series of detective novels revolving around police inspector De Cock (also translated as DeKok) and his side-kick, sergeant Vledder.