Realm of the Sea Emperor Structure Deck is a Structure Deck in the Yu-Gi-Oh! Trading Card Game (TCG). It is the twenty-third Deck in the TCG's Structure Deck series, following Samurai Warlords Structure Deck. This Deck is the TCG equivalent of Structure Deck: Roar of the Sea Emperor in the OCG.

Each Realm of the Sea Emperor Structure Deck' contains 40 cards in total. The number of card of each rarity are as follows:

- 1 Ultra Rare

- 2 Super Rares

- 37 Commons