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| image name = SD1-DeckEN.png | image size = 150 px | image caption = ''[[Structure Deck: Dragon's Roar]]'', one of the first two Structure Decks to be released worldwide

A '''Structure Deck''' (Japanese: ストラクチャーデッキ ''Sutorakuchā Dekki'') is a retailed, pre-made [[Main Deck|Deck]]. It is similar to a [[Starter Deck]], but is based on a certain [[Type]], [[Attribute]], strategy, or [[Yu-Gi-Oh!]] character. Each Deck is designed to be playable straight from the box.  The older Decks included at least one single new card, printed as an Ultra Rare ; after the ''[[Structure Deck: Curse of Darkness|Curse of Darkness Structure Deck]]'', they always introduce 5 new cards, 1 or 2 of them being a [[Ultra Rare]], 2 of them [[Super RaresRare]]s, and the remaining 2 as Commons [[Common]]s (usually Spells or Traps).  As opposed to [[Starter Deck]]s, (with the exception of ''[[Starter Deck: Duelist Toolbox|Duelist Toolbox]]'', ''[[Super Starter: V for Victory|V for Victory]]'', ''[[Super Starter: Space-Time Showdown|Space-Time Showdown]]'', and ''[[Starter Deck: Yuya|Yuya]]''), Structure Decks may include multiple copies of the same card. They are made to play with them, unlike starter decks, that are made to learn how to play. The [[Playmat|mat ]] included, also features the cover monster in the background; somewhat blocking the visibility of the card zones. You can get cards that are good for your structure deck in booster packs. Another popular way to power up a structure deck is to buy multiple copies of a single Deck and combine the Deck's best cards into one. ==Differences between the ''OCG'' and ''TCG''==The ''OCG'' has a subseries of Structure Decks known as ''[[Structure Deck R]]'', which revamp old ''OCG'' Structure Decks for the modern environment. In the ''TCG'', these decks are simply released as standard Structure Decks with the word "Reloaded" on the bottom left of the cover.  Modern ''OCG'' Structure Decks come with an [[Enhancement Pack]]. These packs typically come with five cards associated with the Structure Deck's theme, with one or two new cards included. All Enhancement Packs come with the same five cards, but one random card is a [[Secret Rare]]. All standard Structure Decks from ''[[Structure Deck: Soulburner]]'' onward, and all Structure Deck R Decks from ''[[Structure Deck R: Dragunity Drive]]'' onward, contain an Enhancement Pack. In the ''TCG'', the cards from the Enhancement Packs are included in the main Structure Deck, and have fixed rarities.