Neptunus is the baseball team of the Neptunus Sporting Club in Rotterdam, the Netherlands. Following its 2014 championship season, the club signed a sponsorship contract for the 2015, 2016 and 2017 seasons with Curaçao and competes under the name Curaçao 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. In 2010 they set a league record by winning 39 games in a single season. The notable yacht designer, Tony Castro, has long worked with Neptunus.