Joannes van Heymissen OCist (1621–1678) was the 36th abbot of Hemiksem Abbey.

Heymissen was born in 's-Hertogenbosch, which until 1629 was one of the four chief cities of the Duchy of Brabant in the Habsburg Netherlands.

He was unanimously elected abbot in 1660, following the death of Judocus Gillis.

During his period as abbot the west front of the abbey, including the tower, were completed.

However the abbey church was destroyed by a fire during works on the roof.