Kellenberg Memorial High School boasts a very active and talented softball program featuring three teams for maximum participation. Latin School students, grades 7 & 8 may participate on the Latin School team, while the high school students have  Junior Varsity and Varsity teams.

During the 2011 – 2012 school year, both the Junior Varsity and the Varsity squads won the Nassau Suffolk Catholic High School Association Championship at their respective levels with the Varsity team finishing the year being ranked # 1 on Long Island and # 1 in New York State and #49 in the Nation as ranked by ESPN. During the 2012-2013 season, both the JV and Varsity squads won the NSCHSAA Championship again and the Varsity team repeated as NY State Catholic Champs by defeating St. Joseph by the Sea and Font Bonne Academy. The Varsity team finished the season ranked #2 in New York State. In the 2013 – 2014 season, the Varsity Softball team won a 4th consecutive NSCHSAA title and a third consecutive NYS Catholic High School title. The team finished ranked #2 on Long Island and #3 in New York State.