The SNP ex-councillor said the people of the Spanish region would welcome the Capital’s support for the “democratic principle” that people should be able to determine their own future.
He said: “We should demonstrate our solidarity with the people of Catalonia by flying the Catalonian flag from the ramparts of the City Chambers as soon as possible.
“This is a turning point in history and the Catalonian people will be looking for friends and allies throughout Europe and the rest of the world.
“It might just be a small gesture but Edinburgh is Scotland’s capital and I’m sure it would be appreciated by the people of Catalonia.”
A council spokesman said there were no plans to fly the Catalonian flag at the City Chambers.