* As a geographical region: You would capitalize "Nordic" when referring to the region of Northern Europe comprising Denmark, Finland, Iceland, Norway, and Sweden.
* Example: The *Nordic* countries are known for their beautiful landscapes.
* As an adjective: You would not capitalize "Nordic" when using it as an adjective to describe something related to the region.
* Example: She has a *Nordic* accent.
* As part of a proper noun: If "Nordic" is part of a proper noun, like "Nordic Council" or "Nordic Games", you would capitalize it.
* Example: The *Nordic* Council is an intergovernmental organization.
In short: Capitalize "Nordic" when it refers to the region as a proper noun, but not when it's used as an adjective.