This is a list of "twin towns" or "sister cities" — that is, pairs of towns or cities in different countries which have town twinning arrangements.
Note that the list is likely to always remain incomplete, since no canonical list of such arrangements exists. Any twinning arrangement should be listed at two locations in the list: once for each of the towns involved in the arrangement.
Due to the extreme size of this list and for ease of navigation, the list is divided into separate lists by continent, which are then organized by country. Lists for some countries have in turn been moved to separate lists, which are linked individually below.