Sybil Fawlty is a fictional character from the BBC sitcom Fawlty Towers. She is played by Prunella Scales. Her age is listed as 34 years old as seen on her medical chart in the 1975 episode "The Germans", thus presumably indicating that she was born in 1941. Scales was 43 years old when Fawlty Towers began.

She is Basil Fawlty's wife, and the only recurring character in the series who regularly refers to him by his first name (the Major addresses Basil by his first name in "Communication Problems"). Sybil is a far more effective worker and manager than Basil; she handles crises calmly, picks up the pieces after a nasty confrontation and stays polite to guests. Unlike, Basil, who yearns to turn Fawlty Towers into "an establishment of class", catering exclusively to the highborn members of society, Sybil is more realistic and down-to-earth when it comes to clientele, and all that concerns her is the hotel making money rather than the class of guest who stay there. Despite her effectiveness as a worker, however, she is known to be extremely lazy; during busy check-in sessions or meal-times, while everyone else is busy working around her, she's frequently seen talking on the phone to one of her friends (usually 'Audrey', who makes an appearance in "The Anniversary"), smoking, chatting with customers, or reading Harold Robbins' novels. In "The Kipper and the Corpse", she does little to help Basil, Manuel and Polly with the disposal of Mr. Leeman's body, prompting Basil to direct all the complaints to her. He does the same trick in "Waldorf Salad". Basil is utterly terrified of Sybil, describing her to Irish builder O'Reilly in "The Builders" as having the ability to "kill a man at ten paces with one blow of her tongue."

Sybil is the strong figure in the marriage, as Basil is completely incapable of handling even the simplest of tasks. In "The Germans" Sybil is in hospital for less than a whole morning, and in that short period, Basil succeeds in infuriating the guests with an argument over the specific time of a fire drill, setting of a burglar alarm, getting jammed underneath a desk, and the hotel quickly caught fire.

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