Shelby Corcoran is a recurring fictional character from the Fox musical comedy-drama series Glee. Portrayed by actress Idina Menzel, Shelby was introduced in the fourteenth episode of the show as the coach of Vocal Adrenaline, a rival show choir to New Directions, the show's primary musical group. Fans had lobbied for Menzel to be cast as Rachel Berry's (Lea Michele) biological mother, due to the strong physical resemblance between Menzel and Michele. After it is revealed that Shelby is, in fact, Rachel's biological mother, Shelby discloses that she had signed a contract that stated that she could not seek out her daughter until she was eighteen. She tells Rachel that instead of trying to act like mother and daughter, they should just be grateful that they have met, and maintain their distance.
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