Alan Warner took the prestigious James Tait Black fiction prize for his latest novel The Deadman's Pedal.
The Oban-born writer received the £10,000 prize, awarded annually by the Edinburgh University English Literature department, at the Edinburgh Book Festival.
Warner is best known for his 1995 work Morvern Callar, which was adapted into a film starring Samantha Morton.
He is Writer in Residence at Edinburgh University.
The Deadman's Pedal sees a teenage boy leave school to work as a train driver and become immersed in a new world with new difficulties.
The James Tait Black biography prize was awarded to art historian Tanya Harrod for her work on a renowned potter.
Harrod received the £10,000 award for The last Sane Man: Michael Cardew, Modern Pots, Colonialism and the Counterculture.
Fiction judge Lee Spinks from Edinburgh University said: "Alan Warner's The Deadman's Pedal is an exceptionally fine novel, richly evocative in detail, beautifully poised in execution, which in the story of one young man's journey to adulthood through the mysteries of childhood, sexuality, work, the realities of class society and the experience of divided family loyalties, offers a compelling poetic vision of a changing Scotland."
The James Tait Black Awards were founded in 1919 by Janet Coats, the widow of publisher James Tait Black, to commemorate her husband's love of books.