"Our assessment of the report's findings is that a vote to leave will lead to uncertainties and may lead to increased costs for travel businesses and the travelling public," said Mark Tanzer, chief executive of Abta, which represents 1,200 members, including airlines, tour operators and travel agencies.
"Our view is that the potential risks and downsides are not matched by an equal upside for the traveller," he added.
It said that a Brexit - Britain's exit from the EU - "could jeopardise" the flow of trade and travel between Britain and mainland Europe, fuelled by the "high likelihood of uncertainty" during negotiations after the June 23 referendum.
"This could last until a replacement set of trading relations and regulations were in place, which could take several years," said the report.
A Brexit could also hit the value of the British pound, making foreign travel more expensive, it added.
Around three-quarters of foreign holidays taken by Britons are in the EU and 63 per cent of tourists in Britain come from the EU.
The top five tourist destinations for Britons are Spain, France, Italy, Portugal and Greece.
Of those visiting Britain from the EU, the French are the most numerous, followed by Germans, Italians, Spaniards and Dutch.
Bookmakers currently have a vote to remain in the union as 1/2 favourite, but some polls have the two camps neck-and-neck.
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