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Birthday (バースデイ) is a story collection by Japanese writer Koji Suzuki and first published on February 5, 1999 in Japan. It is the fourth installment of Suzuki's Ring series.

In November 1990 during the events of Spiral, Mai Takano wakes up at the bottom of an exhaust shaft of a building near Tokyo Bay. The only way out of is by climbing a cloth tied to a beam above, but her ankle is broken and the shaft is too small for her to move about. Mai also finds out that she is pregnant, despite never having a sexual encounter. She experiences bouts of leaving and entering unconsciousness and tries to recall her life and the events leading up to this point. As a former aide of Ryuji Takayama, who died of the ring virus, she was ordered by his publisher to search for some missing work papers in his childhood home. Once there, Mai was entranced by Ryuji's copy of the cursed video, took it home and watched it. Upon watching, she felt movement in her belly and underwent morning sickness. Mai realizes that the fetus caused her to go into a trance. Under its control, she left her home with a cloth and a sack of towels, went to the shaft, tied the cloth to climb down. She slipped, fell, and broke her ankle. Mai's pregnancy is soon due and she gives birth to a baby whom she realizes is Sadako Yamamura, reborn. The baby Sadako cuts her umbilical cord from the placenta, wipes herself with the towel, and leaves the shaft using the cloth. It flashes a grin at Mai and throws the cloth back into the shaft, leaving her to die.

Hiroshi Toyama calls journalist Kenzo Yoshino to tell him more about Sadako Yamamura. Yoshino has just attended Kazuyuki Asakawa's funeral and also receives news of Mai Takano's death in an exhaust shaft. Toyama is nearing his fifties, a twice married man with children and a stable job, but he longs to meet Sadako, the only woman he truly loves. He recounts to Yoshino events that transpired 21 years earlier, when Toyama was merely a young sound director trainee of Theater Group Soaring. Toyama had a secret affair with Sadako, who begged him not to reveal it to outsiders as she still wanted to achieve success as a stage actress without controversy. Sadako pointed out the existence of an altar with a wrinkled umbilical cord behind Toyama's work room, which unsettled him. Toyama was further unsettled when Sadako groped director Yusaku Shigemori, which she stated was just a way to keep him away from her. She later apologized by having sex with Toyama in his work room. Toyama felt as if her voice penetrated his head directly. Upon the end of his story, Yoshino reluctantly tells Toyama that Sadako is probably dead. Yoshino then relays the truth of what happened at the end of the play that he heard from another surviving ex member. During the closing party, Toyama was out of the theater complex to drink. Another trainee named Okubo, who had a crush on Sadako, was rummaging through the sound room when he found a tape recording Sadako and Toyama's intercourse. Jealous, he broadcast it to the green room, where several people, including Shigemori heard it. The next day, Shigemori mysteriously died after supposedly visiting Sadako's apartment. The day was when Sadako disappeared from Toyama's life for good. Yoshino says that all of the people who heard the recording, including Okubo, died in the previous year one after another. Toyama becomes paranoid of his mortality, as while he did not hear the recording, he was present in it. He also knew that Sadako used her thoughtography to record the sex tape. A week after the meeting with Yoshino, Toyama feels aches in his heart and collapses at a street. He sees a woman in green dress following him while carrying an umbilical cord. Upon closer look, Toyama realizes that the woman is Sadako reborn, and the cord is the one she cut from Mai's womb. Instead of becoming frightened, Toyama welcomes her and dies in Sadako's arms.

Following the events of Loop, Reiko Sugiura is called to meet with Toru Amano, a scientist of the LOOP project. She is shown events in the project: the deaths of Mai Takano and Hiroshi Toyama, both connected by Sadako Yamamura. Amano reveals to Reiko about the LOOP project, a simulated but alive universe mirroring the real world, how it was frozen 20 years ago just when the project was consumed by Sadako and her ring virus/Metastatic Human Cancer Virus (MHCV), and how Kaoru Futami, a reincarnation of Ryuji Takayama and Reiko's lover, had found a cure to neutralize the virus. Amano says that Kaoru entered the LOOP to find the cure and therefore is dead in the real world. However, he made a promise to Amano and Prof. Eliot to allow him meet with Reiko face to face. Reiko dons virtual reality goggles and gloves and is thrust into the LOOP, where she meets Kaoru attempting to assure her that everything is alright. Months go by and Reiko is awaiting for the due of her son by Kaoru. Having lost her husband, her son, Ryoji, and Kaoru, loneliness increasingly overwhelms her, although she is keeping in touch with Kaoru's father, Hideyuki, who has been cured of the MHC. She periodically checks the LOOP to see Kaoru, whom she learns has rapidly aged from a 20 year old to a 37 year old, and finally to an old man in his sixties. Reiko is told that other than the neutralizer, Kaoru also found a virus that manages to make the Sadako clones of LOOP rapidly age and die; however, because Kaoru is also a clone, he is affected by the virus as well. Eventually, Reiko has to see Kaoru die at a street while dreaming of Reiko. When her time is due, Reiko gives birth to a healthy boy. She sees Kaoru's spirit appear in her room. He cradles their son and says "happy birthday".

Vertical Inc. published the English translation of Birthday in December 2006.

The Ring AREA – contains the cursed videos of the Ring cycle and their scene by scene analyses, as well as much other useful information. Vertical Inc. – publisher of English translations of the Ring novels.