Like all state and state-integrated schools in New Zealand, the governance of the school is in the hands of the Board of Trustees. As Hamilton Adventist School is a state-integrated school some of the trustees are elected and some are appointed by the proprietors (the New Zealand Seventh-day Adventist Schools Association). Staff also elect one trustee to the Board. Board elections are held every three years.

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The Board meets on the last Monday of every month, except for when the Monday falls in the school holidays. Dates and times will be published in newsletters, or check with the school office. The meetings are open to the public to observe and are held in Room 1.

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The role of the Board is to ensure good governance, to appoint staff, to hear serious student discipline cases and to plan strategically for the future.