Arnoldus Nijlen (Nijmegen,? - Brussels, 1603) was the third bishop of Groningen. He was appointed bishop in 1593 and had to resign his seat a year later, after the reduction of Groningen.
Nijlen was dominican. He had entered the Jacobine monastery in the city, where he received control in 1576. In 1589 he graduated in Cologne in theology, after which he was appointed to the vicar of the diocese of Groningen in the same year. The then-named bishop, Jan van Bruhesen, was actually appointed in Utrecht in 1592, before he had taken office in Groningen, after which Nijlen was appointed bishop in Groningen.
After a year in office, the city was taken by Maurits and the friesian city of Willem Lodewijk, after which the Catholic Church was banned and the bishop had to leave the city. Nijlen drew to Brussels where he died and was buried in the Dominican Monastery in 1603.
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