The Gringai people, a group of indigenous people of Australia, are those Australian Aborigines that were united by a common language, strong ties of kinship and survived as skilled hunter–fisher–gatherers in family groups as a clan of the Wonnarua people, whose traditional land is now known as the Hunter Region of New South Wales, Australia.
Gringai lands are mostly in the Allyn River valley, and include what is now known as Dungog, Paterson, Gresford, Brookfield, Tocal, to the headwaters of the Williams and Chichester rivers. Gringai land also includes the southern valleys of the Barrington Tops.
Two people of the Gringai are known by that name as a result of their arrest and subsequent trials. Wong-ko-bi-kan and Charley were both arrested within a year or so of each other in the 1830s. Wong-ko-bi-kan was sentenced to be transported to Tasmania for manslaughter after spearing a John Flynn, where he died soon after. Charley was the only man to be hanged in the town of Dungog on the Williams River, as a demonstration to his fellow Gringai.
- Miller, James (1985). Korri a Will to Win. Angus & Robertson.
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- "Indigenous history". Visit Dungog. Dungog Shire Visitor Information Centre. 2009. Retrieved 13 May 2012.
- "Summary of Tocal's history". Tocal Homestead. CB Alexander Foundation. Retrieved 15 April 2009.
- "Aboriginal associations with the park area". Barrington Tops National Park. NSW National Parks & Wildlife Service. Retrieved 13 May 2012.
- "History in the Williams Valley - The Gringai".