The club was formed in 1962 when Sydney Rugby Union established a Second Division of the Sydney Grade Competition. That competition was absorbed into the
New South Wales Suburban Rugby Union 'Subbies' competition in 1993 bringing Hornsby, Mosman,
Drummoyne and UNSW with it. In their first year in the new competition Hornsby won the 1st Division Club Championship (Bruce Graham Shield) along with the 2nd Grade, 3rd Grade and Colts Premierships. Hornsby was relegated to Second Division in 1998 and to Third Division in 2012. Hornsby transferred to the Central Coast Rugby Union's competition for the 2015 season. ==Club information==