For the sixth year in a row, Melbourne has topped The Economist's list of the world's most liveable cities.

Lord mayor Robert Doyle said retaining the title was something for which all Melburnians should be proud.

"We do not take this title for granted and are constantly planning and implementing policies that will continue to improve our quality of life," Cr Doyle said.

"It is an exciting time in Melbourne: We've got many major infrastructure projects under way, including the Metro Tunnel, and the proposed renewal of the Queen Victoria Market precinct."