A woman has been charged over an alleged glassing attack, which took place on board P&O's Pacific Explorer on Saturday night.

The incident involving a bucks party, the woman and her partner forced the vessel to return to Sydney Harbour, where the passengers were taken off the ship.

The men were subsequently released without charge pending further inquiries, while Marine Area Command investigators charged the 37-year-old woman, a Russian National, with reckless wounding and affray.

She was taken to Newtown Police Station, before being granted conditional bail and will appear at the Downing Centre Local Court on Friday 9 March 2018.

Police say the woman, who is the partner of one of the men, 'allegedly struck a 21-year-old man on the head with an empty wine bottle, causing a laceration'.

The cruise ship was on a three-night round trip from Sydney when the incident occurred.

Following the incident on board, P&O Cruises’ Pacific Explorer asked NSW Police Marine Area Command to escort a group of people from the ship due to their behaviour.

Passengers told 9NEWS the wild brawl broke out outside a bar called the Blue Room after a woman was “hit on” by a group of men, resulting in a person being glassed.

Six men and a woman were removed from the ship and onto an awaiting boat at Bradleys Head this afternoon.

"It was one hell of a bucks party, that's it," one of the men told 9NEWS. 

"It was just boys being boys."

Another said "it just was a very good bucks party" despite being pulled off the boat by police and having his holiday cut short. 

“This is in line with our strict policy of zero tolerance of excessive behaviour that affects the safety, comfort and enjoyment of other guests,” a P&O Cruises’ statement stated.

“While these occurrences are rare, we have no hesitation in taking strong action when necessary that adheres to this policy.

“The group removed today will no longer be welcome to travel with P&O Cruises or any of its associated brands.”

The Pacific Explorer will dock at White Bay tomorrow as planned. 

© Nine Digital Pty Ltd 2018