Holidaymakers could face fines of up to €300,000 (£250,000) for breaking new rules across the Balearic islands.
A new law that comes into effect this week could see fines ranging from €300 (£253) to €300,000 for those who do not comply.
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The new law prohibits holidaymakers from attending illegal parties in the region, and also applies to organisers, owners and collaborators of such gatherings.
Further explaining the new measures and who they will apply to, the Balearic government explained: "In this way, public gatherings or crowded leisure and entertainment events, for profit, held in spaces that are not considered public establishments and that are marketed outside the conventional channels, are considered illegal parties.
"The fines will cover the organisers and the people who profit from these activities; participants who, with their uncivil attitude, put people's health or the environment at risk; the professionals and companies that collaborate in the organisation and celebration of these events and the people who own the spaces where the illegal party takes place.
"The inclusion of owners and professionals and organising companies as responsible is another novelty that includes this change."
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Member of the Balearic government, Mercedes Garrido, added: “We have been looking for measures to stop illegal parties and to make organisers think twice when they plan a party.”
The rules will not apply to family gatherings, with resident of the Balearic government, Francina Armengol, clarifying that an illegal party is an event that 'is held in a home, with a lucrative effect, to which people pay to go and that is marketed outside conventional channels.'
Following the news, Brits are being warned against attending such parties, with an embassy spokesperson explaining: "There have been a number of serious accidents involving people attending irregular commercially promoted parties in villas and private homes on the islands of Ibiza and Majorca.
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"Licensed clubs and bars are required to meet safety and security standards, including emergency exits and capacity limits, and to have trained, licensed security staff. Irregular commercial parties may not meet these standards."
Last month, we told you how Brits have been warned about a new alcohol cap on all-inclusive holidays in Spain.
Now, limits will be applied to the booze on specific all-inclusive breaks across the Balearic Islands, according to the local government.
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Thomas Cook recently told customers that the new limit of six alcoholic drinks per person per day had previously been introduced and that they can only consume these beverages during mealtimes.
You can read more on that here.
Lucy Devine