The data, compiled by Oxford Economics on behalf of the WTTC, analysed staff shortages across the UK and other major travel and tourism markets, including the US, Spain, France, Italy and Portugal, between July - December 2021 and 2022.
All countries reportedly showed "significant" staff shortages, with employment demand starting to outstrip the available labour supply.
The UK was predicted to see a shortfall of around 12%, with one in eight job vacancies left unfilled.
Julia Simpson, WTTC president and chief executive, said the UK’s economic recovery "could be jeopardised" if the jobs aren’t filled as travellers return.
