John Jones, Talysarn, was a Welsh Calvinistic Methodist minister, regarded as one of the greatest preachers in the history of Wales. Because the name "John Jones" was one of the most common in Wales at the time, he is usually differentiated by others of the same name by the use of the suffix "Talysarn", denoting the village where he lived.

This article is about the particular significance of the year 1857 to Wales and its people.