It was claimed the 51-year-old had been involved in an altercation at The Emporium wine bar in Clitheroe on May 21, with 23-year-old builder Josh Gillibrand claiming to have been assaulted.
Moyes was reportedly the subject of abuse on the night, with Gillibrand denying his involvement and Lancashire Constabulary have now confirmed no further action will be taken following a "thorough investigation".
"After careful consideration of all the circumstances in this case it has been decided that no further action will be taken against anyone," a spokesperson said.
"A thorough investigation has been carried out and everyone identified as having been involved in this incident or having witnessed it have provided accounts to the police.
"All these accounts were given voluntarily, it has not been necessary to arrest any person.
"These accounts have been considered and it has been decided that this is the most appropriate course of action."
Moyes replaced Sir Alex Ferguson as United manager last summer but was sacked in April following a disastrous campaign.