The question of who will don the mantle of Lord Voldemort (the most dangerous dark wizard of all time in the Harry Potter saga) remains a magical mystery. Who is Playing Lord Voldemort in HBO’s Harry Potter Series? What We Know About The TV Tom RiddleHBO's Harry Potter television series is chugging along quite nicely ahead of its 2027 debut, but there's one thing the project still has to do: touch its finger to the Dark Mark. In other words, fans are eagerly awaiting an announcement on who don the mantle of the dark wizard obsessed with power, immortality, and the Unforgivable Curses—Lord Voldemort. Oscar winner Ralph Fiennes (Schindler's List, The King's Man) took over in the fourth installment, Goblet of Fire, as the reborn Voldemort, whom he played through Deathly Hallows Part 2.Who is playing Voldemort in the Harry Potter television series?