Ellen Adair as Bess McTeer, one of Julian's victims.

Grayson Eddey as Laine Tannetti, Cora's son.

Robert Funaro as Ron Tannetti, Mason's father.

Eric Todd as Frankie Belmont, a beach-goer stabbed to death by Cora.

Rebecca Wisocky as Margaret Lacey, Cora's aunt.

Nadia Alexander as Phoebe Lacey, Cora's sister.

Enid Graham as Elizabeth Lacey, Cora's mother.

Kathryn Erbe as Fay Ambrose, Harry's wife.

Patti D'Arbanville as Lorna Tannetti, Mason's mother.

Joanna Adler as Anne Farmer, a police captain.

Chris Messina as Nick Haas, Jamie's friend from college.

Eddie Martinez as Vic Soto, a Dorchester police detective who helps Harry on the case.

Parisa Fitz-Henley as Leela Burns, Jamie's wife who is expecting their first child.

Matt Bomer as Jamie Burns, an expectant father and Dorchester resident who seeks Harry's support after an accident.

Natalie Paul as Heather Novack, a police detective.Abby Miller as Caitlin Sullivan, a police sergeant.Dohn Norwood as Dan Leroy (guest season 2), a police detective.Jessica Hecht as Sonya Barzel (seasons 3–4), an artist whom Harry begins dating in season 3.

Brady Jenness portrays the young Harry Ambrose in season 2.Bill Pullman as Harry Ambrose, a police detective.A tragedy occurs there involving the daughter of a prominent family, and he is recruited to help the investigation. In the fourth and last season, the now-retired Ambrose travels to northern Maine to recover from the previous case. In the third season, Ambrose investigates a fatal car accident in Upstate New York and uncovers a much larger and disturbing case behind it. In the second season, Ambrose returns to his hometown after a young boy named Julian Walker confesses to poisoning a couple and learns secrets that the inhabitants are determined to keep buried. In the first season, Detective Harry Ambrose delves into the past of Cora Tannetti, a troubled woman, to determine why she stabbed a man to death. Biel was also nominated for a Primetime Emmy Award for Outstanding Lead Actress in a Limited Series or Movie.

The first season of The Sinner received nominations for the Golden Globe Award for Best Miniseries or Television Film and Best Actress – Miniseries or Television Film for Jessica Biel. The show's success led to USA Network turning it into an anthology series, which aired for four seasons from August 2, 2017, to December 1, 2021. Intended as an eight-part miniseries, The Sinner premiered to critical acclaim and high ratings. Only Pullman appears in every season, while the rest of the cast mostly changes for each season's story. Bill Pullman stars as a police detective who investigates crimes committed by unlikely culprits and attempts to uncover their motivations. It is named after Petra Hammesfahr's 1999 novel, which served as the basis for the first season. The Sinner is an American police procedural anthology television series developed by Derek Simonds for USA Network.

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