Neptunus is a professional baseball and softball club in Rotterdam, the Netherlands.

Neptunus is the most successful team in the Honkbal Hoofdklasse, the top level of professional baseball in the Netherlands. It has won the Holland Series 21 times. That includes seven consecutive titles from 1999 to 2005. During that dominant stretch, Neptunus also won the continental European Cup five consecutive times from 2000 to 2004. In 2010, the team set a single-season Dutch league record by winning 39 games.

The club evolved out of the multi-sports club SC Neptunus, which was founded on 1 June 1900. The baseball department was founded on 3 May 1943 and the softball department on 17 June 1973. Although the club fielded a football team in the past, Neptunus is primarily known for baseball and softball.

Following its 2014 championship season, the club signed a sponsorship contract for the 2015 through 2017 seasons with Curaçao and competes under the name Curaçao Neptunus. The club has revenues of 1 million euros.

Honours National Hoofdklasse: 22 (most in the league) 1981, 1991, 1993, 1995, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2009, 2010, 2013, 2014, 2015, 2016, 2017, 2018, 2024, 2025, 2026 KNBSB Cup: 15 1992, 1995, 1997, 1999, 2000, 2001, 2002, 2003, 2005, 2009, 2010, 2011, 2013, 2014, 2017

International European Cup: 10 1994, 1996, 2000, 2001, 2002, 2003, 2004, 2015, 2017, 2018 European Super Cup: 7 1995, 1997, 1999, 2000, 2001, 2002, 2003

European Champions Cup record Year Venue Finish Wins Losses Win% Manager 2018 Rotterdam 1st 5 0 Ronald Jaarsma 2019 Bologna 3rd 4 1 Ronald Jaarsma 2021 Ostrava 4th 2 3 Ronald Jaarsma 2022 Bonn 7th 3 2 Raily Legito Total 14 6

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