Tabitha Anastasia "Tibby" Tomko-Rollins is a fictional character in the 2001 novel "The Sisterhood of the Traveling Pants" and the 2005 film based upon it. She is a member of the titular club, along with her friends Lena Kaligaris, Bridget Vreeland and Carmen Lowell. She was portrayed by Amber Tamblyn in the film.
Tibby's parents are the only parents of the four girls who hyphenated their last names.