According to figures reported in the Guardian, women are paid an average of 86p for every pound that men are paid in the public sector.
Private companies with more than 250 employees are required to report their gender pay gaps by the end of this financial year, so figures are set to be revealed on 4 April.
However, the deadline for public sector companies was midnight on 30 March. Nearly nine in ten public sector organisations reported a median pay gap in favour of men.
So far, 5,079 companies have revealed their gender pay gap, which includes a selection of charities, government bodies and private firms.
Rachel Reeves, Labour chairwoman of the Business, Energy and Industrial Strategy (BEIS) committee, said: “These figures highlight how far there is to go to tackle the huge gender pay gap.
“We need more women in senior positions to help drive the culture change needed to tackle these gender pay gaps."