The Yuwaalaraay, also spelt Euahlayi, Euayelai, Eualeyai, Ualarai, Yuwaaliyaay and Yuwallarai, are an Aboriginal Australian people of north-western New South Wales.

The ethnonym Yuwaalaraay derives from their word for "no" (yuwaal) to which a form of the comitative suffix, -iyaay/ayaay/-araay, is attached.

While AUSTLANG cites Euahlayi, Ualarai, Euhahlayi, and Juwalarai as synonyms for the Gamilaraay language in earlier sources, more recent sources suggest different distinctions. Yuwaalaraay is one of six dialects or languages of Gamilaraay.

According to Robert M. W. Dixon, Ualarai is a Wiradhuric tongue, a dialect (Yuwaalaraay) of Gamilaraay. The Yuwaalaraay distinguished various kinds of Gamilaraay, telling K. Langloh Parker:

With us, Byamee the name is not derived from the verb to make-which is gimberleegoo; maker, gimberlah --this word is also used in the Kamilaroi tribes, some of which are within a hundred and fifty miles of us. But the Kamilaroi that Ridley knew are some three and four hundred miles away, so the language is sure to have variations; our Euahlayi language has only a few of the same words as the Kamilaroi.

Parker herself worked mainly with a particular Yuwaalaraay subgroup, the Nhunggabarra, whose clan name derives from the word nhungga ('kurrajong tree').

The Yuwaalaraay traditional lands stretch over an estimated 4,600 square miles (12,000 km²). It is on the Narran River and from the Narran Wetlands (Terewah) through to Angledool near the Queensland border. It takes in Walgett to the southeast. Running southwest, it extends from the Birrie and Bokhara rivers to Brewarrina. The western frontier lies between the Culgoa and Birrie rivers. The northernmost area covered by Yuwaalaraay country extends as far as Dirranbandi, Queensland, where the Culgoa and Balonne rivers meet.

Yuwaalaraay country is rather dry even over winter, which permitted a longer gathering and conservation of seeds as a food resource.