Melbourne's not just the world's most liveable city. It's also the happiest, a new survey shows.

A poll of 15,000 people from 32 cities - including Barcelona, Berlin, Tokyo and New York - showed the Victorian capital outranks its competitors for happiness, a Time Out City Life Index said.

The survey looked at anonymous data across seven categories: food and drink, culture, relationships and community, neighbourhoods, affordability, happiness and liveability.

Melbourne was voted the fourth top city in the world, narrowly missing out to Chicago, Porto and New York.

Nine out of 10 Melbournians said they felt happy in the past 24 hours and 89 percent said they enjoyed living there.

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