- "When I was 12, I was all elbows and knees and Allana looked like a goddess sent to torture me."
- ― Margaery Tyrell
Allana is a member of House Tyrell.
Allana is mentioned by her cousin Margaery while chatting with Sansa Stark. According to Margaery, when she was 12, she was very clumsy and Allana looked like a goddess sent to torture her. Allana used to call Margaery "Pig-face", and whenever she passed Margaery in the halls, she'd oink, so Margaery prayed that she'd catch a horrible skin disease. Margaery tells Sansa that a week after that, Allana came down with "porridge plague". Only when Margaery bursts out laughing, Sansa understands it is a joke. Sansa asks what has become of Allana, and Margaery answers that she grew up to be the most beautiful woman and married a handsome lord and they have darling children and live in a castle by the sea. Margaery finds this very frustrating, but Sansa assures her that Allana must be very jealous of her, now that she is going to become a queen. 
In the books
In the A Song of Ice and Fire novels there is no character named Allana, either of House Tyrell or any other house.