International
The International Labor Organization (ILO) is the only tripartite United Nations agency, and since 1919 has brought governments, employers and workers of 187 Member States together to set labor standards, develop policies and devise programs promoting decent work for all women and men.
Thirty-five countries presently, excluding the United Stated, have ratified and set in force the ILO's Convention 158, Article 4 which states, "[t]he emeployment of a worker shall not be terminated unless there is a valid reason for such termination." These include: Australia, Finland, France, Spain, Sweden, and Ukraine (though present martial law during wartime has impacted application). Additionally, the vast majority of western democracies have already enacted just cause protections into their labor codes.
Canada, the United Kingdom, Germany, the Netherlands, Japan, Mexico, and Brazil all have standards of just cause.