|“||Samantha, don't be a gossip!||”|
— Marianna to Samantha Gilbert in 1912 (flashback)
Marianna Lockwood was a character who appeared in the sixteenth episode of the third season of The Vampire Diaries. She was from the Lockwood family line, making her an ancestor of the main character, Tyler Lockwood. She was also best friends with Samantha Gilbert.
Marianna Lockwood was a member of the Lockwood Family.
In 1912, Marianna lived in Mystic Falls and was best friends with Samantha Gilbert. Sometime later she was killed by Stefan Salvatore, who had become a Ripper after drinking human blood for the first time in decades. At the time, she was probably thought to be another victim of the "Mystic Falls serial killer," who had been murdering other members of the Founder's Council. Ten years after her death, her friend Samantha confessed to the murders as a result of her psyche being corrupted by the effects of the Gilbert ring, which, when worn, will resurrect humans from a supernatural death, after dying numerous times. The town assumed Samantha was crazy as a result of murdering her fellow Founding Family members and subsequently locked her up in an mental institution, where she remained for the rest of her life.
Not much is known about her personality, although she like to gossip.
Marianna was a young women of fair complexion and dark brown hair.
- Marianna is from Slavic descent and is a very popular feminine name. It means "bitter" or "grace". 
- Lockwood is English and means "enclosure forest". 
- She was a member of the Founder's Council due to the fact that she was born into one of the Founding Families.
- Sage suggested that Damon feed on "innocent" girls, like Marianna or Samantha Gilbert, which indicated that she hadn't killed anyone before
- With the Other Side's collapse and the destruction of Hell, she either found peace or went to a dimension similar to Hell.
- Marianna: (to Stefan) "I'm sorry for your loss, Mr. Salvatore. I'm told you're a distant cousin of Zachariah?"
- Marianna: (to Stefan) "Lockwood. Marianna Lockwood. And this is my friend, Samantha... Samantha Gilbert."
- Marianna: "Samantha, don't be a gossip! Shame on you."
- -- 1912