Donald X. Vaccarino is an American board and card game designer best known for creating Dominion (2008), the game widely credited with popularising the deck-building genre. Dominion won the Spiel des Jahres award and was followed by numerous expansions. Vaccarino later won a second Spiel des Jahres for Kingdom Builder (2012). He appears in board game documentaries discussing game design and the modern tabletop industry.