Jacob van der Borgh, (Latinized: Jacobus a Castro; 1560 – 1639) was the third bishop of Roermond, in the Netherlands.

In 1579 he graduated in philosophy at the top of his year and was appointed a lecturer in Pig College (Pedagogie Het Varken).

[2] Among the students that he taught there were Jacobus Boonen, a later archbishop of Mechelen, and Petrus Peckius the Younger, a later Chancellor of Brabant.

He invited the Jesuits to establish their first presence in the city, giving them his own house for the purpose.

Castro remained in the city, and risked his own life to tend the sick during the epidemics of 1634 and 1635.