Gold Coast police have charged two women with serious assault following investigations into an incident on a Gold Coast bus at Kirra on February 25 in which a 77-year-old New South Wales man was allegedly assaulted.

The New South Wales women, a 17-year-old from Chinderah and a 21-year-old from Terranora, have been remanded in custody and are due to appear in the Southport Magistrates Court tomorrow.

Both women were also charged with public nuisance.