List of The Big Bang Theory and Young Sheldon characters

The American television sitcom ''The Big Bang Theory'', created and executive produced by Chuck Lorre and Bill Prady, premiered on CBS on September 24, 2007, and ended on May 16, 2019, while the ongoing American comedy spin-off prequel television series ''Young Sheldon'', created and executive produced by Lorre alongside Jim Parsons and Steven Molaro, premiered on CBS on September 25, 2017.

''The Big Bang Theory'' initially centers on five characters: Leonard Hofstadter and Sheldon Lee Cooper, two physicists and roommates; Penny, their neighbor who is a waitress and aspiring actress; and Leonard and Sheldon's friends and coworkers aerospace engineer Howard Joel Wolowitz and astrophysicist Raj Koothrappali.

Over time, several supporting characters have been introduced and promoted to starring roles, including physicist Leslie Winkle, neuroscientist Amy Farrah Fowler, microbiologist Bernadette Maryann Rostenkowski-Wolowitz, comic book store proprietor and friend of the other characters Stuart Bloom. The series also features numerous supporting characters, each of whom plays a prominent role in a story arc. Included among them are parents of the main characters, their dates and their coworkers. Celebrities such as Stephen Hawking appear in cameo roles as themselves.

''Young Sheldon'' initially centers on Sheldon Cooper at the age of nine, going to high school and living with his family in the fictional town of Medford, East Texas, Sheldon's mother, Mary; his father and the head football coach at Medford High, George Sr.; his twin sister, Missy; his older brother, George Jr.; and his grandmother, Constance "Connie" Tucker, also known as "Meemaw". The series also features numerous supporting characters, each of whom plays a prominent role in a story arc. Included among them are Sheldon's present and former classmates, their dates and coworkers, and those of his family. Celebrities such as Elon Musk appear in cameo roles as themselves. Jim Parsons, who portrays the adult Sheldon Cooper on ''The Big Bang Theory'', narrates the series and serves as an executive producer. Provided by Wikipedia