Where was the How to Train Your Dragon film series filmed?

The How to Train Your Dragon film series has 2 titles (2025 to 2027), filmed at 2 places in 1 country. Wikipedia names 2 more. Every place links to its source.

The productions, in order

Every filming location they used

Each place appears once, even when several titles were filmed there.

Named in Wikipedia's own articles

Places named only in the titles’ Wikipedia articles.