John Prince-Smith (London, 1809—Berlin, February 3, 1874) was an English-born, German free trade liberal and politician.
Prince-Smith was born in London, England, where his father worked as a barrister. John went to Eton in 1820, but after his father's death two years later, he found work in various jobs as an apprentice. In 1830, he moved to Hamburg, and found work in Elbing, where he worked as an English language teacher.
The (liberal) merchants in the port cities of Prussia suffered from the protectionist measures of the Zollverein, and Prince-Smith soon found himself becoming political active, becoming one of the more outspoken proponents of free trade. Prince-Smith believed protectionist tariffs to be harmful in general, and argued that worldwide free trade would lead to universal peace. With the advent of the Anti-Corn Law League in Britain in the 1840s, a likewise movement was started in the Prussian port cities. Prince-Smith became mentor of such later free traders as Julius Faucher and Max Wirth. In 1860, at an economic conference in Cologne, the free trade movement was successful in getting essential reforms put forth to the Zollverein.
Prince-Smith was elected to the first Reichstag in 1870.