Voluntaryism (UK /ˈvɒləntərɪˌɪzəm/,[1] US /ˈvɒləntɛriˌɪzəm/;[1] sometimes voluntarism /ˈvɒləntəˌrɪzəm/),[2][3] is a libertarian philosophy which holds that all forms of human association should be voluntary.