The 20-year-old, who is a student at the Danish tour guide school in Lloret de Mar outside Barcelona, returned to the school in a confused state on Monday after being missing for nine hours.
"Unfortunately I can confirm that one of our students has probably have been raped," Christiane Karlsen, the Managing Director of the Service & Co tour guide academy, told Ekstra Bladet. "But we know nothing about whether she has been stunned by drugs. She remembers very little and has had a blackout for several hours."
She said that she had now banned the woman from drinking alcohol .
"Of course we are all very sad on the Norwegian student's behalf," she told the paper. "And we have prohibited that she drink alcohol again while she's on the course."
The school has encouraged the woman, who comes from Bergen, to report the rape to the Spanish police.