The KNBSB has named the umpires appointed for the 30th edition of the Haarlem Baseball Week.
From June 26 to July 5, 2020, six referees will be featured at Pim Mulier Stadium. The following referees have been appointed:
- Edwin Louisa
- Martijn Bosschaart
- Peter de Haan
- Rob Has
- Roy van de Wateringen
- Winfried Berkvens