Monster is an American biographical crime drama anthology television series created by Ryan Murphy and Ian Brennan for Netflix. Murphy and Brennan both serve as showrunners. The series follows the lives of "monstrous figures", with each season following a different killer or killers.

The first season, The Jeffrey Dahmer Story, focuses on serial killer Jeffrey Dahmer (Evan Peters), and released on Netflix on September 21, 2022. The series was initially conceived as a limited series, but was renewed for a second and third season in November 2022. The second season, The Lyle and Erik Menendez Story, focuses on the murder case of the Menendez brothers (Nicholas Alexander Chavez as Lyle Menendez and Cooper Koch as Erik Menendez), and released on September 19, 2024. In September 2024, the third season, titled The Original Monster, was announced to be focusing on killer Ed Gein (Charlie Hunnam).

The first two seasons received mixed reviews from critics but were ultimately a commercial success, both reaching the number-one spot on Netflix in the first week of their release. The Jeffrey Dahmer Story became Netflix's second most-watched English-language series of all time within 28 days, and the third Netflix series to pass 1 billion hours viewed in 60 days. It received four nominations at the 80th Golden Globe Awards and six nominations at the 75th Primetime Emmy Awards. Peters won the Golden Globe Award for Best Actor – Miniseries or Television Film, while Niecy Nash won the Primetime Emmy Award for Outstanding Supporting Actress in a Limited or Anthology Series or Movie. The Lyle and Erik Menendez Story received three nominations at the 82nd Golden Globe Awards, including Best Limited or Anthology Series or Television Film.