Giimbiyu is an extinct Aboriginal Australian language isolate once spoken by the Giimbiyu people of northern Australia.

The name Giimbiyu is a Gaagudju word for 'of the stoney country'.

It was introduced in Harvey (1992) as a cover term for the named dialects,[2] In 1997 Nicholas Evans proposed an Arnhem Land family that includes the Giimbiyu languages.

However, they are not included in Bowern (2011).

[3] Capell (1942) lists the following basic vocabulary items:[5]