In 1973, the Catholic schools in Nashua changed their status from parish schools to a regional school system. When this plan went into effect, Nashua Catholic Junior High opened its doors to educate seventh and eighth grade students at 72 Vine St. in the former St. Louis Grammar School building.  In the fall of 1976, the school enrollment was expanded to include a ninth grade program to satisfy the requests of parents.  To accommodate the increase in enrollment, the ninth grade used the St. Patrick School facility.

           

In the fall of 1992, Nashua Catholic moved to its present location at 6 Bartlett Avenue, occupying the main building of the former Mount St. Mary High School.  Administration, faculty, and staff have worked tirelessly to provide a challenging curriculum, a variety of sports programs, community service opportunities, and fine arts programs.  In 2001, the staff  was expanded by the addition of a development director.  Through the efforts of the development director, the school has received generous financial support from parents and members of the local business community.  In recent years, a technology program was established, including a computer lab and internet connections in all classrooms.  To enhance the curriculum, an arts program was piloted in which teachers shared their individual talents with the students.  This experimental program then evolved into regularly scheduled music and art classes with certified instructors.  Rehearsals for band and chorus, which had been scheduled after school, were now included as a regular part of the school day.

           

In June of 2004, Nashua Catholic graduated its last ninth grade class.  The reconfiguration of the Nashua public junior high and high schools impacted the ninth grade enrollment to the extent that it was no longer feasible to maintain a ninth grade.  Beginning in the fall of 2005, Nashua Catholic consisted of the seventh and eighth grades.
 

In recent years, extra curricular opportunities were added to the school culture.  They include an Extended Day Program, a week-long Summer Day Program, a week-long summer Study Skills Program, summer athletic camps, and GOALS (Guided Organization, Assignments, and Learning Skills).  In the past, students have been educated by religious from the Sisters of Mercy, Sisters of the Holy Cross, Sisters of Notre Dame, Sisters of St. Anne, and Brothers of the Sacred Heart.  Currently, the faculty is composed of highly qualified lay teachers.