Right wing/Haredi Orthodox Rabbinical organizations
The National Council of Young Israel (NCYI)
Agudath Israel of America (aka the Agudah)
Agudath HaRabonim – The Union of Orthodox Rabbis Of The United States and Canada
Iggud Harabanim (Rabbinical Alliance of America) over 800 members.
The Chief Rabbinate of Israel
The Federation of Jewish Communities (FJC) Hardi, in former Soviet Union
The Conference of European Rabbis (CER) is the primary Orthodox rabbinical alliance in Europe. It unites more than 700 religious leaders of the mainstream synagogue communities in Europe.
Modern Orthodox groups
The Rabbinical Council of America (RCA), and The Union of Orthodox Jewish Congregations of America. Over 1000 rabbis.
The United Synagogue (United Hebrew Congregations of Great Britain and the Commonwealth)
International Rabbinic Fellowship (founded 2007) Over 120 rabbis affiliated with the Yeshivat Chovevei Torah Rabbinical School (YCT)