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.

Each Structure Deck: Onslaught of the Fire Kings contains 40 cards in total. The number of card of each rarity are as follows:

- 1 Ultra Rare

- 2 Super Rares

- 2 Rares

- 35 Commons