Structure Deck: Onslaught of the Fire Kings is a Structure Deck in the Yu-Gi-Oh! Official Card Game (OCG). It is the twenty-fourth deck in the OCG's Structure Deck series (thirty-second including the Character Structure Decks), following Structure Deck: Roar of the Sea Emperor. The TCG equivalent of this deck is Onslaught of the Fire Kings Structure Deck.
The deck features the FIRE attribute. Cards from this deck can be combined with card(s) included in Cosmo Blazer. It also includes many reprints, as well as introducing the "Fire King" archetype to the OCG.
Each Structure Deck: Onslaught of the Fire Kings contains:
- 1 Preconstructed Deck of 40 cards
- 1 Rulebook
- 1 Playing Guide
- 1 Playmat