Sir Tom John Marsters, is the current King's Representative to the Cook Islands. He is a former Deputy Prime Minister of the Cook Islands, Foreign Minister, and Deputy Leader of the Cook Islands Party.

The King's Representative is the official representative of Charles III, as King of the realm of New Zealand, in the Cook Islands. The office of King's Representative is established by the Constitution of the Cook Islands. They are appointed by the King for a term of three years, and may be reappointed. When the Cook Islands has a queen regnant, the viceroy is titled Queen's Representative.