Sir Cecil Clementi Smith GCMG PC (23 December 1840 – 6 February 1916),[1] was a British colonial administrator.

On 3 September 1878,[3] Clementi Smith took office in Singapore as a Colonial Secretary in the Straits Settlements, and understudied Governor Frederick Weld.

Smith became known for his effective work in quelling Chinese secret societies in the Straits Settlements, such as those in Singapore which had been terrorising locals for decades.

He was president of the commission of inquiry on the Trinidad riots in 1903, and was chief British delegate to International Opium Convention at The Hague in 1912.

[9] His nephew was Sir Cecil Clementi who also served as Governor of the Straits Settlements and in other administrative positions in Hong Kong and Singapore.