Local residents spent hours clearing the lawns in front of the Grade 1 listed building after students celebrated the end of term on Saturday afternoon ahead of a ball.
A University of Bath spokesman said the students’ behaviour had been “unacceptable and disappointing”.
He said: “The university apologises for the behaviour of some of its students who left the Royal Crescent in an unacceptable state on Saturday evening, and is very grateful to those local volunteers.”
“This unofficial ‘party’ happened prior to the students’ union summer ball that took place on campus, and was an event of which neither the university nor students’ union were aware in advance.
The University of Bath – which charges £9,000 per year for all on-site undergraduate courses – is a campus-based university located two kilometres from the World Heritage city.
One volunteer, Rob Harvey, said “It took local residents to tidy up the mess and make sure this national treasure could be viewed in its full beauty without the aftermath of the party being an eyesore.
“Thanks should be offered to the unofficial litter pickers, one whom was injured on broken glass and treated at the Royal Crescent Hotel.
“The litter pickers would appreciate donations from the partygoers towards Help for Heroes or St John’s Ambulance, as a kind gesture towards the clean-up operation.”
The university spokesman added that both the university and students’ union would seek to repair the damage to community relations by finding opportunities for students to contribute to the local community over the coming year.
The summer ball took place at the University of Bath campus on Saturday night and included a set by Radio 1 DJ Zane Lowe.