Jozef-Ernest van Roey was a Belgian Cardinal of the Roman Catholic Church. He served as Archbishop of Mechelen from 1926 until his death, and was elevated to the cardinalate in 1927. He was a significant figure in Catholic resistance to Nazism in Belgium.

The cardinal electors in the 1939 papal conclave numbered 62 and all of them participated. They are arranged by region, and within each alphabetically.