Isobel Marion Dorothea Mackellar, (or better known as Dorothea Mackellar) OBE (1 July 1885 – 14 January 1968) was an Australian poet and fiction writer. Her poem My Country is perhaps the best known Australian poem with its second stanza beginning "I love a sunburnt country/A land of sweeping plains,/Of ragged mountain ranges,/Of droughts and flooding rains." ...

The only daughter of noted physician and parliamentarian Sir Charles Mackellar, she was born in Sydney in 1885. Although raised in a professional urban family, Mackellar's poetry is usually regarded as quintessential bush poetry, inspired by her experience on her brothers' farms near Gunnedah, in the north-east of New South Wales.

Her best-known poem is My Country, written at age 19 while homesick in England, and first published in the London Spectator in 1908 under the title Core of My Heart: the second stanza of this poem is amongst the most well known in Australia. Four volumes of her collected verse were published: The Closed Door (published in 1911, contained the first appearance of My Country); The Witch Maid, and Other Verses (1914); Dreamharbour (1923); and Fancy Dress (1926).