Becky Brock was discovered by a cleaner in the hotel room she was staying in while holidaying on the party island.
The cause of death is a mystery and a post-mortem is due to be carried out of the 18-year-old girl by the end of today.
According to local reports her body was found at around 11am on Monday.
She was staying at the Marco Polo Hotel in San Antonio.
There were, reportedly, no signs of any violence and police suspect she died of natural causes.
Officials for the Civil Guard and the hotel complex have yet to comment.
The popular youngster, from Nottingham, had dual British and Dutch nationality.
Friends uploaded snaps of the holiday on to social media showing the bikini-clad blonde enjoying drinks poolside.
Devastated pals last night paid tribute to the tragic teen.
Beth Knight said: “You were the most thoughtful and caring friend. Thinking of you forever.”
Her death comes a week after fellow Brit Danielle McCallum, 18, died in the same town.
A Foreign Office spokesman said: “We are providing consular assistance to the family.”