Bülbül yuvasñ (, ), literally "nightingale's nest" or "Bulbuls nest", is a Middle Eastern phyllo dough dessert. It takes its name from its hollow and circular shape. Having been baked, warm syrup is sprinkled, and the hollow center is filled with pistachios before being served.
According to the Nià Âanyan etymological dictionary, the Turkish name is a compound of ("nightingale") and yuva ("nest"), with the possessive suffix -sñ, literally meaning "nightingale's nest." The word bülbül itself is a borrowing from Arabic (), which is an onomatopoeic term with the same meaning.
In Arabic, sometimes the name swar as-sitt () is used instead, which is derived from its shape.
An 1844 Syrian and Egyptian Arabic dictionary by Swedish Orientalist contained descriptions of a pastry known as or (), described as small box-shaped cases made from a dough of flour and butter, filled with minced meat and nuts such as pine nuts, seasoned with pepper and salt, and baked on large metal trays. It also noted sweet variants instead filled with pistachios or almonds. The same book also describes "sowwar es-sitt" () as "madame's bracelet; a pastry prepared in the same way as baklava, and formed into bracelets."
In some varieties of 'ush al-bulbul, the phyllo pastry is sometimes replaced with a nest-shaped roll of knafeh pastry, with whole pistachios in the middle, made to resemble bird eggs, this style of pastry is popular in Egypt and the Levant. This variety is sometimes referred to as "bird's nest baklava", or as "bulbul's nest knafeh" ().
The name may also refer to a Syrian meat patty, similar to sfiha.