By some optimistic estimates, there are as many as 130 castles in Luxembourg but more realistically there are probably just over a hundred, although many of these could be considered large residences or manor houses rather than castles.
[1] The present list of castles in Luxembourg runs to about 50 and includes all the well-known fortresses and residential chateaux in the country.
Below the main list, there is a sublist mentioning some of the other castles which may be included at a later date.
This is a list of less important castles or castles which are not yet covered by articles in the English Wikipedia.
Media related to Castles in Luxembourg at Wikimedia Commons