Egyptian playwright and novelist who broke with traditional Arabic literature by mixing colloquial dialect with conventional classical Arabic narration in the writing of realistic stories about ordinary villagers.

Idrīs studied medicine at the University of Cairo (1945–51) and was a practicing physician in Cairo when he began to write fiction. As a committed leftist, he initially supported President Gamal Abdel Nasser's reforms but later, in 1954, was imprisoned for opposing Nasser.

Idrīs' first anthology of stories, Arkhas layali (The Cheapest Nights), appeared in 1954 and was quickly followed by several more volumes, including A-laysa kadhalik (1957; Isn't That So?). In the 1960s he sought to create a uniquely Egyptian dramatic form using colloquial language and elements of traditional folk drama and shadow theatre. He presented this plan in a series of three essays entitled “Towards a New Arabic Theatre,” and he tried to put it into practice in his own plays, notably Al-Lahzat al-harija (1958; The Critical Moment), Al-Farafir (1964; The Farfoors, or The Flipflap), and Al-Mukhatatin (1969; The Striped Ones). Idrīs' other major works included the novels Al-Haram (1959; The Forbidden) and Al-ʿAyb (1962; The Sin). In the Eye of the Beholder: Tales of Egyptian Life from the Writings of Yusuf Idris (1978) and Rings of Burnished Brass (1984) are two collections of his works published in translation.