Quái thú Đồng bộ Tuner/Tuner Synchro Monsters (Nhật: シンクロチューナーモンスター Synchro Tuner Monsters) là Quái thú Đồng bộ nhưng cũng đồng thời là Quái thú Tuner. Trong khi trước đây có thể xử lý Quái thú Đồng bộ làm Tuner bằng cách dùng các lá bài như là "Lightwave Tuning", "Psychic Tuning",.v.v.., thực tế thì việc "in" các Tuner Synchros lần đầu giới thiệu là trong Starstrike Blast. Bất kỳ luật hay điều kiện được áp dụng thông thường cho cả Quái thú Đồng bộ hay Quái thú Tuner đề sẽ áp dụng cho số quái thú này.
In the anime, Tuner Synchros are required to perform an Accel Synchro Summon, a method of Synchro Summoning that uses Synchro Material Monsters that are themselves Synchro Monsters. A monster Summoned by such a method is known as an Accel Synchro Monster. All Accel Synchro Monsters possess an effect in the anime that allows them to be Summoned during the opponent's turn.
In the TCG/OCG, all Accel Synchro Monsters were changed to regular Synchro Monsters, and their inherent effect that allowed them to be Summoned during the opponent's turn was removed. However, in exchange, the first two Tuner Synchro Monsters to be printed ("Formula Synchron" and "T.G. Wonder Magician") gained an effect that allowed the player to conduct a Synchro Summon during the opponent's turn, as long as it was one of the Synchro Material Monsters used. In this way, those two monsters could be used to Summon any Synchro Monster during the opponent's turn, rather than just Accel Synchro Monsters.
Initially, the only Tuner Synchro Monsters released were those used in the anime; however, more have been released alongside the comeback of Synchro Monsters since the release of Xyz Monsters. There are currently seven Tuner Synchro Monsters in the OCG/TCG, three of which were initially shown in the anime and four of which were brand new:
The manga also includes an additional Tuner Synchro Monster (later on in the manga is revealed that "Stardust Spark Dragon" is also a Tuner Synchro Monster):
- Một số Quái thú Đồng bộ "Assault Blackwing", chẳng hạn như "Assault Blackwing - Raikiri the Rain Shower", có các hiệu ứng nhằm xem chính chúng như một Tuner.