Neptunus is the baseball team of the Neptunus Sporting Club in Rotterdam, the Netherlands. The title sponsor of the club is currently DOOR Training so that the official name of the team is DOOR Neptunus. Baseball club DOOR Neptunus has a revenue of 1 million euros.
Neptunus plays in the Honkbal Hoofdklasse, the top level of professional baseball in the Netherlands, where it is its most successful team. It won the Holland Series seven consecutive times from 1999–2005 and won the European Cup five consecutive times from 2000–2004.The notable yacht designer, Tony Castro, has long worked with Neptunus.