Diederik Boer (born 24 September 1980) is a Dutch former professional footballer who played as a goalkeeper.

[1] After retirement in 2019, he is now the goalkeeping coach for the PEC Zwolle youth teams.

He made his professional debut on 8 March 2003, when FC Zwolle lost to Ajax 5–0.

[2] On 31 August 2014, he signed a three-year contract with Ajax to replace the departed Kenneth Vermeer as second keeper behind Jasper Cillessen.

This biographical article related to association football in the Netherlands, about a goalkeeper, is a stub.