Brighton players Anton Rodgers, George Barker and Lewis Dunk, along with former team-mate Steve Cook, had denied assault at what was a retrial after the jury in the first trial in February was unable to reach a verdict.
Rodgers, Barker and Cook were also found not guilty of voyeurism, a charge that Dunk had been cleared of at an earlier trial.
The prosecution had alleged that the quartet had found the drunken woman at a club, taken her to a hotel room while she was unconscious and assaulted her.
She claimed to have woken up at the hotel to find her dress pulled down and then discovered explicit pictures on Rodgers's mobile phone.
The woman was said to have "told a pack of lies" after the incident and admitted lying to police and her employers, but said she had been humiliated by the players.