Gert Jan Maarten "Gert-Jan" Segers (born 9 July 1969) is a Dutch politician who was Leader of the Christian Union between 2015 and 2023.

From 2008 to 2012, he was the chairman of the Christian Union think tank Mr. G. Groen van Prinsterer Stichting.

[2] He is also a columnist for the Dutch newspaper Nederlands Dagblad; he wrote two books criticising political Islam, as well as two novels.

Prime Minister Mark Rutte first turned toward GroenLinks to form his third cabinet, but policy disagreement between the parties prevented participation.

On 13 January 2023, Segers announced his resignation as leader of the Christian Union.