The Australian Defence Force says it is investigating allegations that members of the Australian Army have posted derogatory comments on social media about women in the north Queensland city of Townsville.

On one site, a Townsville man who appears to be in the Army has referred to women in the city as sluts.

He has also used other derogatory descriptions of women in the city.

The site has been taken down this afternoon.

Thousands of soldiers from the Army's 3rd Brigade and 11th Brigade are based at Lavarack Barracks in Townsville.

The Department of Defence has declined to comment to the ABC.