Jean de Wachtendonck, Latinized Joannes (1592–1668) was the eighth bishop of Namur, in the Spanish Netherlands (now in Belgium).

In 1651 he was named bishop of Namur, but his installation was delayed until 1654 due to suspicions of Jansenism.

He reported favourably to Pope Alexander VII on the cause for the beatification of the Martyrs of Gorcum.

In April 1668 he succeeded Andreas Creusen as archbishop of Mechelen but died in Brussels on the way to his new see.

[1] His eulogy of the Infanta Isabella was published as: He was also the author of a life of St Rumbold: