Thyssen is a Low Frankish and Dutch patronymic surname.
It is derived from the common given name Thijs, a short form of Mathijs (Matthew).
The Dutch digraph ij and the y ("ij" without dots) were used interchangeably until the surname spelling fixations around 1810.
While Thijssen is the more common form in the Netherlands, "Thyssen" prevails elsewhere.
It may refer to: