Here are some associations I'm interested in joining (in this order):
Society of Biblical Liturature: The Society of Biblical Literature is the oldest and largest international scholarly membership organization in the field of biblical studies. Founded in 1880, the Society has grown to over 8,500 international members including teachers, students, religious leaders and individuals from all walks of life who share a mutual interest in the critical investigation of the Bible.
American Academy of Religion: In a world where religion plays so central a role in social, political, and economic events, as well as in the lives of communities and individuals, there is a critical need for ongoing reflection upon and understanding of religious traditions, issues, questions, and values. The American Academy of Religion's mission is to promote such reflection through excellence in scholarship and teaching in the field of religion.
The Søren Kierkegaard Society: The purpose of Søren Kierkegaard Society (SKS) is to encourage study and discussion of the thought of Søren Kierkegaard in all its dimensions and ramifications, including its sources and influences. Affiliated with both the American Academy of Religion / Society of Biblical Literature (AAR/SBL) and the American Philosophical Association (APA), the Society alternates its annual business meeting between AAR/SBL and APA conventions. The Society encourages scholarship on Kierkegaard at the national and regional meetings of the AAR/SBL and APA through an Executive Committee which includes members of both organizations.
Something I'd like to consider:
American Philosophical Association: The American Philosophical Association is the main professional organization for philosophers in the United States. Founded in 1900, its mission is to promote the exchange of ideas among philosophers, to encourage creative and scholarly activity in philosophy, to facilitate the professional work and teaching of philosophers, and to represent philosophy as a discipline.
There are other philosophical associations I'm interested in, but not sure if I have the time to invest anything into them. I'm really interested in Process Theology, Process Philosophy, and Process Thought so might consider joining an association dealing with Process studies.