Local government workers are taking to the streets to call for an end to the public sector pay freeze and a commitment to paying people a living wage.
Unions predict that thousands of Scotland's council workers will come out in support of Fair Pay Day.
They are calling on councils to implement a living wage of £7.20, insisting that this was a commitment made by both Labour and the SNP before the election.
Unions also call for an end to the pay freeze for public service workers.
Unison, GMB and Unite members will mark Fair Pay Day with a petition urging politicians and the public to sign up to fair pay for local government workers.
Members will also hold lunchtime demonstrations, lobby councillors and have campaign stalls.
Unison's local government committee chair Stephanie Herd said: "Local government workers are among the lowest paid in the public sector, with more than 18,000 workers currently paid less than the living wage of £7.20.
"Teaching assistants, care workers, librarians, school catering staff, refuse collectors, street cleaners: they are all struggling to make ends meet and can no longer afford this continued pay cut.
"Employers need to look at the damage they are inflicting on local government workers and realise that the pay freeze must thaw."
Unison regional organiser Dougie Black said: "The cost of gas, electricity, fuel and food has risen sharply while local government workers' pay has remained the same. This means workers are worse off now than before — it's not a pay freeze, it's a pay cut.
"The lowest paid are carrying the heaviest burden as they have to spend a higher percentage of their income on heating their homes and feeding their families.
"But it's not just a matter of fairness, it also makes economic sense as increased wages would boost local economies.
"The major parties in Scotland made a commitment to the living wage prior to the election and we are calling on Scotland's councils to honour their promise and insist on fairness and decency for their workforce."