"Hush" is the tenth episode in the fourth season of the supernatural drama television series Buffy the Vampire Slayer (1997–2003). It was written and directed by series creator Joss Whedon and originally aired in the United States on December 14, 1999, on The WB. After reading critical response to the series in which the dialogue was praised as the most successful aspect of the show, Whedon set out to write an episode almost completely devoid of speech. Only about 17 minutes of dialogue is presented in the entire 44 minutes of "Hush".

In "Hush", a group of fairytale ghouls named "The Gentlemen" come to town and steal everyone's voices, leaving them unable to scream when The Gentlemen cut out their hearts. Buffy and her friends must communicate with one another silently as they try to discover why no one can speak and find whoever is murdering the townspeople. They must also find ways to express their feelings about each other and keep some semblance of control as the town descends into chaos.

The episode was highly praised when it aired and was the only episode in the entire series to be nominated for an Emmy Award in Outstanding Writing for a Drama Series; it also received a nomination for Outstanding Cinematography for a Single Camera Series (Michael Gershman). "Hush" addresses the limits and assets of language and communication and the disruption to society when communication breaks down. The Gentlemen are often counted as some of the series' most frightening villains, and the episode is frequently included on lists of the best of Buffy the Vampire Slayer.

During a college lecture where Professor Walsh is discussing the difference between language and communication, Buffy has a dream in which Riley kisses her. They are interrupted by a young girl holding a distinctive box, singing a cryptic rhyme about "the Gentlemen". Riley and Buffy speak after class and they almost kiss, but are unable to stop talking. They leave when it becomes awkward. Buffy calls Giles to tell him of her dream and the details of the little girl's rhyme. In the middle of Xander and Anya's argument with each other over the meaning of their relationship, Giles asks Xander to allow Spike to stay over at his house, as Giles' girlfriend Olivia will be visiting him from London for a few days.

Meanwhile, Willow attends a meeting of the campus Wicca group, hoping to meet others who share her interest in studying witchcraft, but is disappointed when they only talk about bake sales. Willow raises the subject of spells but is chastised for pandering to the stereotype about witches performing magic. A shy woman in the group, Tara Maclay, starts to speak up to support Willow's suggestion, but falls silent when the attention turns to her.

That night, as Sunnydale sleeps, white wisps float from each person's mouth to a belfry, where they settle in the box from Buffy's dream, as ghoulish skeletal figures with metal-toothed grins and impeccable black suits look on. In the morning, Buffy and Willow discover they are unable to speak and become visibly distressed; they soon discover that everybody is unable to speak. The group gathers at Giles' house, where they see that the news is reporting that Sunnydale is suffering from an epidemic of laryngitis. Buffy and Riley, each concerned that chaos will ensue, find each other attempting to keep order on the streets. Buffy does not know about Riley's paramilitary role as an agent of the government-controlled, demon-capturing Initiative; he in turn is unaware that she is the Slayer. They exchange a look and then their first kiss, before parting to continue their efforts.

The next night, the ghouls leave the belfry and float into town accompanied by their straitjacketed, deformed minions. They knock on the door of a student. When he opens it, roused from sleeping, they hold him down and carve out his heart while he tries in vain to scream. At Giles' apartment, Olivia is frightened by one of the Gentlemen outside Giles' window. The following morning in a campus classroom, Giles uses a series of overhead transparencies to explain to the others that the Gentlemen steal the townspeople's voices so no one can scream as they gather the hearts they need, and that folklore indicates that they have been vanquished before when a princess screamed: the only thing that will kill them is a live human voice.

On her own, Tara finds a spell to help the town get their voices back, and goes out to show it to Willow. On the way to Willow's dorm she trips, turns around and sees the Gentlemen floating toward her. In Willow's dorm she frantically knocks on doors which no one will open; the Gentlemen steadily pursue her. Willow hears Tara's panicked knocking down the hall and exits her room as Tara sprints into her, sending them both tumbling. They lock themselves into a laundry room and try to barricade the door with a vending machine, but it is too heavy for them to move. Willow, injured, sits and concentrates on moving the machine with telekinesis; she fails, but Tara sees what she is doing. They clasp hands and the machine moves swiftly across the room, blocking the door.