1866 in Wales

Centuries:	17th; 18th; 19th; 20th; 21st;
Decades:	1840s; 1850s; 1860s; 1870s; 1880s;
See also:	List of years in Wales; Timeline of Welsh history 1866 in The United Kingdom Scotland Elsewhere

This article is about the particular significance of the year 1866 to Wales and its people.