Teaching chiefs are demanding a 10% pay rise in 2018 as the "first step" to restoring wages to an "acceptable level".
The EIS, Scotland's largest teaching union, will submit the pay claim to employers and the Scottish Government via the Scottish Negotiating Committee for Teachers (SNCT).
This will be followed by a social media campaign, highlighting 10 reasons why teachers should be given the substantial rise - including the need to tackle the recruitment "crisis" in the profession.
The Scottish Government's pay policy for 2018-19 proposes a 3% rise for public sectors, but with teachers employed by local authorities their wages are paid by councils.
EIS general secretary Larry Flanagan pledged the union would send a "very strong and very clear message to local authorities and the Scottish Government" that teachers "deserve a substantial pay rise".
The EIS has launched its 2018 Pay Campaign: Value Education, Value Teachers. Today's meeting of EIS Council has also agreed the teachers' pay claim that the EIS will propose via the SNCT - calling for a 10% pay increase for all teachers. See https://t.co/ASiTkd59nc for more info.
-- EIS (@EISUnion) January 26, 2018
He stated: "The Scottish Government has repeatedly said that education is its number one priority, and local authority representatives have also spoken of the importance of teachers in the delivery of high quality education.
"Our campaign will reflect this, in urging that the teachers who are central to the provision of education be properly valued and fairly paid for the vital work that they do.
"A good first step towards restoring teachers' pay to an acceptable level would be the delivery of a 10% pay increase for all teachers in 2018."
Teachers' pay has fallen by "at least 20% in real terms" over the last decade, Mr Flanagan said, adding there was a "substantial amount of data" in support of their Value Education - Value Teachers campaign.
The union leader said: "When increases to pension contributions and national insurance are factored in, Scotland's teachers have suffered a real-terms cut of almost 25% in their take-home pay.
"For the teachers who deliver the government's number one priority - the education of our young people - to be so severely undervalued is something that simply cannot continue. It is time for a fair pay rise for all of Scotland's teachers."
EIS president Nicola Fisher, a primary teacher from Glasgow, said: "For far too long, Scotland's teachers have been punished for a financial crisis which they did not create.
"Austerity and ideologically driven attacks on the public sector from Westminster governments, coupled with financial decisions made here in Scotland, have caused our pay to decline dramatically.
"For almost a decade, we have been subject to a succession of pay freezes, pay caps and real-terms pay cuts. This has demoralised the profession, with severe consequences for teacher recruitment and retention.
"If our employers and the Scottish Government are serious about valuing education, they also need to value us as teachers. This means paying us a fair wage, which compares favourably to other professions and to teachers in other countries."