20th century The school's history dates back to 1911, when Monsignor James Coyle, pastor of Saint Mary's Church, established Saint Mary's High School. The high school grew, and by the early 1930s the need for a larger school was apparent. In 1933, shortly after Monsignor Coyle's death, Monsignor Coyle High School opened on Summer Street, staffed by the Brothers of the Holy Cross. The boys' population transferred to Coyle, and the girls' population stayed at Saint Mary's under the guidance of the
Holy Union Sisters. In 1963, a new high school for girls was opened on the corner of Hamilton Street and Adams Street, named for Bishop
James Edwin Cassidy. However, given the economics of the time, the aging of the old Coyle High School building, and the lack of ordained staff for each school, it was decided in 1971 that the two schools would merge into Coyle-Cassidy High School in the Bishop Cassidy site. The former Monsignor Coyle High School building became known as the Taunton Catholic Middle School, and served the diocese until the 2014.
21st century In February 2014, the school announced that it would begin to host grades 6–8 in a new "Middle School Division", while grades 9-12 would be known as the "High School Division". This was in response to the shutting down of Taunton Catholic Middle School, which had hosted grades 5–8 in a previous Coyle location. The full name of the school was modified to include both divisions. In the 2014–2015 school year, the school had 147 in the middle school level, and this increased to 159 in the 2015–2016 school year; Mary Pat Tranter, the president of the school, stated that she favored the middle school addition. In 2018 the 5th grade was added to Coyle and Cassidy as a result of grade realignments in Taunton; at the time a Catholic elementary there had closed. In 2020, Coyle and Cassidy merged into
Bishop Connolly High School in the wake of the
COVID-19 pandemic, but Connolly did not take Coyle and Cassidy's middle school students, who were instead directed to Our Lady of Lourdes School in Taunton.
Post-Closure In June 2021, the diocese would begin a five-year lease of the property with Bristol Community College, which rebranded it as their Taunton Center. Two years later, the diocese sold the property to the City of Taunton, which would transfer it to the Taunton Public School District the following year. As Bristol Community College's lease began nearing its end in 2025, the district chose to repurpose the space as a high-capacity middle school rather than continue its partnership. Under Bristol Community College, the space was used as their primary venue for sports, and as their center for adult education. Shortly after leasing the space, the college would rebrand their gymansium with the school's Bayhawk branding. ==Academics and school campus==