Susan Lynne Bayh (/baɪ/ BY;[2] November 28, 1959 – February 5, 2021) was an American attorney and First Lady of Indiana from 1989 until 1997.

[3] In 1994, she left the employ of Eli Lilly and taught at Butler University's College of Business Administration, holding the title of distinguished visiting professor.

She earned her Juris Doctor degree from the University of Southern California Law School in 1984.

[3] Bayh and her husband had twin sons, Birch Evans IV (Beau) and Nicholas, born in 1995.

[5] In May 2018, Bayh underwent brain surgery to remove a malignant glioblastoma tumor.