汤玛斯·亨利·赫胥黎，FRS（英语：Thomas Henry Huxley，1825年5月4日－1895年6月29日），英国生物学家，因捍卫查尔斯·达尔文的演化论而有“达尔文的斗牛犬”（Darwin's Bulldog）之称。

他为了对抗理查·欧文的理论而提出的科学论证显示出人类和大猩猩的脑部解剖具有十分的相似性。有趣的是赫胥黎并不完全接受查尔斯·达尔文的许多看法（例如渐进主义），而且，相对于捍卫天择理论，他对于提倡唯物主义科学精神更感兴趣。

作为科普工作的倡导者，他创造了概念“不可知论”来形容他对宗教信仰的态度。

Thomas Henry Huxley PCPRSFLS (/ˈhʌksli/; 4 May 1825 – 29 June 1895) was an English biologist (comparative anatomist), known as "Darwin's Bulldog" for his advocacy of Charles Darwin's theory of evolution.

Huxley's famous debate in 1860 with Samuel Wilberforce was a key moment in the wider acceptance of evolution and in his own career. Huxley had been planning to leave Oxford on the previous day, but, after an encounter with Robert Chambers, the author of Vestiges, he changed his mind and decided to join the debate. Wilberforce was coached by Richard Owen, against whom Huxley also debated about whether humans were closely related to apes.