Pi Beta Alpha (ΠΒΑ) is a fictitious sorority in the Sweet Valley High book series. The sorority is the most popular on the SVH campus, and because of the haughtiness of some of its members, also called the snobbiest. The male equivalent is Phi Epsilon, while not as snobby, was run by egocentric Bruce Patman.
Jessica Wakefield is the president of the sorority, and she, along with Lila Fowler and others of her friends, intend to keep it exclusive. Her most blatant attempt on this, was against junior Robin Wilson, who had the misfortune of being obese. Using some of the most cruel hazing tactics possible, they subsequently blackballed her.
Later on, they relented, and overturned it, after Robin shed the weight, became a cheerleader and won Miss Sweet Valley High. Robin stunned them all by declining the membership.
Although Jessica is the president, her twin sister, Liz isn't as involved with the sorority as Jessica would like. Elizabeth and her friend, Enid Rollins are members in-name-only.
Besides the twins, Lila and Enid, other members include Amy Sutton; Cara Walker; Sandra Bacon; Jeannie West; Suzanne Hanlon; Jennifer Morris; and Maria Santelli.