The Pony of Shadows is a mentioned character in the fourth season of My Little Pony: Friendship is Magic. The Pony of Shadows was first mentioned by Applejack in the episode "Castle Mane-ia" and is described to be a shadow-like ghost or evil spirit that was formed by Nightmare Moon's last remaining magic when she was banished, and roams the old castle of Princess Celestia and Princess Luna.
The strange supernatural occurrences in the castle were first blamed on the Pony of Shadows, but were later rationalized as a result of Pinkie Pie playing an organ connected to various trapdoors, created by the Royal Pony Sisters for fun. However, the Pony of Shadows appears to be real, but nothing is known of it other than a vague silhouette with glowing yellow eyes.
- Some people theorize that the Pony of Shadows is instead either a specter of Starswirl The Bearded, King Sombra, or one of the villains of the G1 My Little pony series (Tirek) or Zecora.