Clemens Gerard Antoon Cornielje (10 June 1958 – 17 March 2022) was a Dutch politician and political consultant and educator.

Born in Lobith, he was member of the People's Party for Freedom and Democracy (Volkspartij voor Vrijheid en Democratie).

[1] Cornielje studied biology and mathematics at a vocational university in Nijmegen to become a teacher in secondary education.

[4] On 2 August 2018, it was announced that Cornielje had temporarily resigned from his duties as King's commissioner because of meningitis.

[7] Clemens Cornielje was one of three openly gay politicians who served as King's Commissioner, the other two are Jan Franssen and Arno Brok.