Civilian staff at the Department of Defence have walked off the job again today over an ongoing pay dispute with the Federal Government.

Community and Public Sector Union (CPSU) members have attended two-hour stop-work meetings to discuss further industrial action.

The staff are among more than 120,000 public servants who have rejected Federal Government pay offers.

Last month Defence staff took industrial action for the first time in more than 20 years, stopping work to attend union meetings.

CPSU deputy national president Alistair Waters says there will be little impact from the stop-work action today, but he expects the industrial campaign will escalate.

"Today's action is a series of stop-work meetings at which members are making decisions on escalating future industrial action and voting on applying work bans," he said.

Mr Waters says staff have been offered a 3 per cent wage rise, well below increases in the cost of living.

He says it is effectively a pay cut.

"The Department and the Government are asking staff to work harder and do more, while putting a pay offer which doesn't keep pace with the cost of living," he said.

A number of other agencies have also taken industrial action, including staff at Parliament House and the Department of Agriculture.

The CPSU expects further strike action is likely if public servants are not offered more reasonable wage agreements.