This study of 28 countries involves comparative content analysis of the English versions of codes of ethics proposed by professional associations. It yielded an empirically grounded typology of principles arranged in twenty categories. The most frequently identified principles were professional development, integrity, confidentiality or privacy, and free and equal access to information. While confidentiality and privacy, and equal access to information, appear in all existing typologies of library and information science ethics, other principles, such as copyright and intellectual property, democracy, and responsibility toward society, which appear in almost all other typologies, were evident in fewer than half of the codes. This empirical study provides a global perspective on library association code of ethics.