Mark Coles Smith (born 1987), also known as Kalaji, is an Aboriginal Australian (Nyikina[1][2]) actor of stage and screen, sound designer, field recordist, writer, and composer.

Coles Smith was born in 1987[3] in Kalgoorlie, in Western Australia, and grew up on a cattle station on the Fitzroy River, two hours' drive east of Broome, in the Kimberley region of the state.

[6] His parents separated when he was young, and he travelled around the country (including at Southern Cross University in Lismore, New South Wales; and in Brisbane, Perth, and Broome) with his mother, who was an academic who lectured in Indigenous mental health.

[14] Coles Smith features as narrator and interviewer in the documentary Keeping Hope, directed by Tyson Mowarin, which examines the high rates of suicide in Indigenous communities in the Kimberley.

[25] Coles Smith played a leading role opposite Jack Charles in ILBIJERRI Theatre Company's Black Ties, first performed for the Sydney Festival in January 2020,[26] then touring to Perth, Melbourne, and then Wellington and Auckland in New Zealand in February and March of that year.

[22] Coles Smith was the sound designer for the play Which Way Home at the Belvoir, produced by ILBIJERRI as part of the Sydney Festival and directed by Rachael Maza Long.

[31] NME reviewer Cat Woods described the music as reminiscent of Icelandic band Sigur Rós, and overall "an atmospheric, expansive adventure in synths, instrumentals, field recordings, and treated vocals – and a meditation on themes of intergenerational wisdom and memory".

Partly recorded on country and produced at Wawili Sound Studios in Broome, Coles Smith explores his relationship with Martuwarra (the Fitzroy River catchment area) and his Nyikina culture.

[35] In 2023 he narrated and co-produced the epic book by Greg Campbell in a 31-year collaboration with senior Law-keeper Lulu (Nyikina elder, Paddy Roe) and the Goolarabooloo people, Total Reset: realigning with our timeless holistic blueprint for living.