Sai OSai O is a village of in the Shap Sze Heung area of Sai Kung North, in Tai Po District, Hong Kong.AdministrationDespite its proximity to the neighbouring areas administered by Sha Tin and Sai Kung districts, Sai O is actually administered by Tai Po District. It is covered by the Sai Kung North constituency of the Tai Po District Council, which is currently represented by Ben Tam Yi-pui. Sai O is a recognised village under the New Territories Small House Policy.