Kinabalu International School has a very active Parents Teacher Association (PTA). The PTA is made up of a teacher representative as well as any parents who wish to volunteer time to support PTA activities. The PTA supports the school in a whole range of ways; it organizes fund raising activities such as the annual ‘School Fair’; it organizes social events such as "Family Dinner", "Family Fun Day" and ‘School Socials’ for pupils.

The PTA also assists the school staff by organizing parent helpers on trips and during class activities. The PTA plays a very important function in assisting  new families, particularly mothers, to find their way around Sabah and establish new friendships. Any new parent to the school who wishes to become involved in PTA activities is most welcome to do so.