Jacob Styne is a member of the Styne Family and is an antagonist in season 10 of the TV show Supernatural. He is portrayed by Jeff Branson.
Little is known about Jacob, other than being a member of the Styne Family. Jacob and his mercenaries have been searching for the Book of the Damned across several countries in Europe. Eventually, he learnt that the hunter Charlie Bradbury unearthed the book in a monastery in Spain, Jacob is sent to hunt her down and retrieve the book for his family.
After learning Charlie had obtained the Book of the Damned from a monastery in Spain, he began pursuing her until they were in America and successfully wounded her during their encounter in an alley. He later pursued her and committed numerous killings along his way, including truck stops and gas stations up and down the way, to capture Charlie and reclaim the book from her. Eventually, he captured Dean in a convenience store. He told Dean that a spell from the book is capable of removing the Mark of Cain, but wonders why Dean would want to remove it, as Jacob considers the Mark a "Gift". Dean later managed to escape from the scene after a fight and killed one of his henchmen. He later came to Charlie's safe house with his henchmen. In a gun fight, he was mortally wounded by Dean and killed by Sam with a fatal stab with a metal knife in his stomach. In his last breath, he swore that his family will never stop looking for that book.