Isobel Marion Dorothea Mackellar OBE (1 July 1885 – 14 January 1968) was an Australian poet and fiction writer.

Her memorial service was held at St Mark's Anglican Church in Darling Point, and she is buried in Waverley Cemetery, in the eastern suburbs of Sydney.

In addition to writing poems, Mackellar also wrote novels, one by herself, Outlaw's Luck (1913), and at least two in collaboration with childhood friend Ruth Bedford.

[4] In the New Year's Day Honours of 1968, Mackellar was appointed an Officer of the Order of the British Empire for her contribution to Australian literature.

[6] A federal electorate covering half of Sydney's Northern Beaches is named in her honour as well as Mackellar Crescent in the Canberra suburb of Cook.

[9] In conjunction with the January unveiling, there was an exhibition of a series of 34 water colour paintings by Jean Isherwood illustrating "My Country".