A one-week municipal services, school and daycare strike will begin on 3 May, unless a resolution to the dispute can be reached.
Public sector trade unions Juko, Jyty and JHL have issued strike warnings for next week for the cities of Helsinki, Espoo, Kauniainen, Vantaa, Oulu, Rovaniemi, Jyväskylä, Tampere, Turku and Kuopio.
The unions are aiming to pressure employers to settle contract disputes mainly focused around employee salary programmes.
If the strike goes ahead, a total of 81,000 workers across the country will be involved, including more than 22,000 teachers. Up to 31,000 employees are set to join the industrial action in the capital region alone.
The strike would see primary schools as well as most daycare centres close their doors until 9 May.
The walkout had been due to begin on 19 April, but Finland's National Labour Conciliator asked Minister for Employment Tuula Haatainen (SDP) to postpone it while efforts to resolve the dispute were ongoing.