Kings in Grass Castles is a 1959 book of history by Dame Mary Durack (1913–1994). The book is considered a classic of Australian literature.

It is the story of Durack's pioneering family establishing its pastoral interests in the Australian outback during the 19th century and concerns the life and times of Durack's grandfather Patrick Durack, an Irish immigrant who became a leader of the overlanders who brought their cattle on hoof to south west Queensland and then later to the tropical north of Western Australia. The book was notable for its portrayal of the role of women and families in the pastoral industry and collaboration and respect between the pastoralists and local Aboriginal peoples.

Durack published a sequel, Sons in the Saddle, in 1983.