Sadako Yamamura (山村 貞子, Yamamura Sadako) is the main antagonist of Koji Suzuki's Ring novel series and its eponymous film series. Her backstory varies between continuities, but all depict her as the vengeful ghost of a young psychic who was murdered and thrown into a well.

Sadako Yamamura (Yamamura Sadako 山村貞子) was the antagonist of the Ring Novels, television drama, and film series in Japan. Her character has been adapted into American and Korean counterparts for their respective localizations of Hideo Nakata's 1998 film, The Ring and The Ring Virus.

Sadako Yamamura is the main antagonist of the Ring franchise and one of the two titular secondary antagonists (alongside Kayako Saeki) of the crossover film Sadako vs. Kayako. She was a young yet troubled psychic who was brutally murdered and thrown into a …

In 2016, Sadako vs. Kayako, directed by Kōji Shiraishi, was released, a crossover of the Ju-on series of horror films. It features Sadakaya, a ghost that resulted from the fusion of Sadako and the Ju-on antagonist Kayako Saeki.

Sadako refers to the principal antagonist of the Japanese version of Ring as well as several works in the series.

Sadako (Japanese: 貞子) aka Sadako KOL (Japanese: 貞子：咒殺 KOL) is a 2019 Japanese supernatural horror film directed by Hideo Nakata. Loosely based on the novel Tide by Koji Suzuki, the film is an installment in the Ring franchise, and a sequel to Nakata's 1999 film Ring 2.

Sadako Yamamura (山村 貞子, Yamamura Sadako), reimagined as Park Eun-seo (Korean: 박은서) and Samara Morgan for their respective adaptations, is the main antagonist of Koji Suzuki's Ring novel series and the film franchise of the same name.