Dracula

Count Dracula was a fictional vampire created by Bram Stoker, inspired by the historical character of the same name.

As such, he belonged to the Sisyphean Society, a council of fictional villains encountered by the Master when he later visited the Land of Fiction. (COMIC: Character Assassin)

Melanicus created an illusion of Dracula to frighten the Fifth Doctor, which the latter dismissed as "a strictly mythical figure drawn largely from a work of Victorian fiction." (COMIC: The Tides of Time)

The character also inspired a robot recreation built in his image which "haunted" the House of Horrors in the Festival of Ghana in 1996. (TV: The Chase)

The Fifth Doctor met his historical namesake, also known as Prince Vlad or Vlad the Impaler, in 1462 (AUDIO: Son of the Dragon) whereas the Sixth Doctor met the literary vampire in the Land of Fiction. (AUDIO: Legend of the Cybermen)

The Tenth Doctor and Martha Jones encountered Dracula on a world of fiction created by the books Martha had read throughout her life. The Doctor punched Dracula and exclaimed that he had a very hard face. (PROSE: The Mystery of the Haunted Cottage)

Minor references
Jo Grant, upon seeing Stangmoor Prison, said that it looked like Dracula's castle. (TV: The Mind of Evil)

When exposing Josiah Samuel Smith to harmful sunlight, Ace called him Dracula. (TV: Ghost Light)

Reverend Wainwright noted that the events of Dracula had taken place near Maiden's Point, where vampires were rising from the sea. (TV: The Curse of Fenric)

Charley Pollard mentioned that she had read Dracula once. (AUDIO: Minuet in Hell)

Maria Jackson thought that there was something spooky about Sarah Jane Smith's house. It had a touch of Dracula's castle. (PROSE: Invasion of the Bane)

Clyde Langer told the following joke about Dracula: "How did Count Dracula escape from Transylvania? He used a blood vessel." to weaken the Pied Piper by causing laughter. (TV: The Day of the Clown)

When Rani Chandra and Clyde Langer saw the sunny Ashen Hill Manor Clyde said that "Castle Dracula" also might have looked okay on a sunny day. (TV: The Eternity Trap)

In the Land of Fiction
Dracula was stationed at Camalot, after Sherlock Holmes died. He was eventually converted into a Cyberman, but it failed as he already was dead. He led the attack on the Cyber Planner, in order to make them believe that Cybermen do not exist. (AUDIO: Legend of the Cybermen)

Behind the scenes
In the Doctor Who universe, real vampires exist as well, as first shown in State of Decay and later in other stories. However the historical Dracula had no connection to them.