Assuming contemporary rather than historical, and in no particular order, here are Scotland’s A List writers:

Writerer’s

James Robertson
James Kelman
AL Kennedy
Alan Warner
Janice Galloway
Alasdair Gray
Jenni Fagan
Andrew O’Hagan
Irvine Welsh
Ali Smith

Poets

Kathleen Jamie
Roddy Lumsden

Journalists/Non-Fiction

Neal Ascherson
Ian Bell
Tom Nairn

Playwrights

David Harrower