Jan Grijseels
Johannes "Jan" Antonius Constantius Marie Grijseels was a Dutch track and field athlete, who competed in the 1912 Summer Olympics. He was a seventeenfold Dutch champion in all track events, running up from 100 to 800 metres.
Grijseels was born in Abcoude-Proosdij and died in Noordwijkerhout.
In 1912, he was eliminated in the semi-finals of the 200 metres competition. He was eliminated in the first round in the 100 metres event.