Jan-Chris de Koeijer

{{Use dmy dates|date=January 2024}}

{{BLP sources|date=May 2010}}

{{Infobox musical artist

|name = Jan-Chris de Koeijer

|alias = Jan Chris de Koeyer

|birth_date = {{birth date and age|df=yes|1966|10|20}}

|birth_place = Yerseke, Netherlands

|background = solo_singer

|occupation = Musician

|instrument = Vocals, bass

|genre = Death metal

|years_active = 1989-present

|associated_acts = Gorefest, Ayreon

}}

Jan-Chris de Koeijer or Jan Chris de Koeyer (born 20 October 1966, Yerseke) is a Dutch bass player and singer. He is best known for his position in Gorefest. He also co-founded the band.{{cite web|url={{AllMusic|class=artist|id=p39113/biography|pure_url=yes}}|title=Biography: Gorefest|last=Huey|first=Steve|publisher=AMG|accessdate=17 May 2010}}

He provided vocals for Ayreon's 1995 debut album, The Final Experiment.

After the disbandment, De Koeyer focused on a studio project called ColdPopCulture, together with Iljan Mol.

In 2004, he took part in the re-united Gorefest.

In 2006, he appeared at EPICA's concert in Paradiso (Amsterdam) as a guest grunter on the song Consign to Oblivion (A New Age Dawns #3).