The Old Sydneians Club is a Specialist Club which is limited in Membership, and is a member of The Sydney Grammar School Club.

The Old Sydneians Club Is open to all members and qualifiers of Sydney Grammar School, Australia. Qualifying ClubMaster Members may create a Club as a member of The Old Sydneians Club, to specifically represent their own year at Sydney Grammar.

The Old Sydneians Club is exclusive to former students, staff, and employees of Sydney Grammar School.