The new set of rules comes after the COVID-19 pandemic and Brexit.
Firstly, those travelling to Spain must ensure their passport was issued in the past 10 years at the time of entry, and it must be valid for at least three months on the date of departure.
A visa is not necessary in the Spain or Schengen Area for up to 90 days in any 180-day period without one.
If asked, some tourists may need to prove that they have enough money for the duration of their stay.
This is around €100 (£85) each day of their holiday, alongside an additional minimum of €900 (£766.94).
The Spanish Ministry del Interior said: "Foreigners from third countries must prove if required to do so by the officials in charge of controlling the entry of people into Spanish territory, that they have economic resources for entering the country, through cash, travellers' cheques, payment letters, or credit cards, which must also be proven to have sufficient funds available on them."
Those heading to Magaluf, El Arenal, Playa de Palma in Mallorca and Sant Antoni in Ibiza are being limited to six alcoholic drinks per day.
That's three free drinks per meal. However, they are able to pay for extra drinks.
Although it's no longer mandatory to provide proof of having had a COVID-19 vaccination, anybody travelling from China will have to show that they've been fully vaccinated or provide a negative test result.
The rule was reinstated in January after concerns about the increase in infections in China.