Thomas Whistler Smith, MLC (26 September 1824 – 11 December 1859) was an Australian businessman, banker and politician. He was a member of the New South Wales Legislative Assembly from 1857 until his early death in 1859 at the age of 35. He was the deputy chairman and managing director of the Commercial Banking Company of Sydney (now National Australia Bank), having been made one of its directors in 1850.