Harry Collins, FLSW, is a British sociologist of science at the School of Social Sciences, Cardiff University, Wales. In 2012 he was elected a Fellow of the British Academy. In 2013, he was elected a Fellow of the Learned Society of Wales.

The sociology of scientific knowledge (SSK) is the study of science as a social activity, especially dealing with "the social conditions and effects of science, and with the social structures and processes of scientific activity." The sociology of scientific ignorance (SSI) is complementary to the sociology of scientific knowledge. For comparison, the sociology of knowledge studies the impact of human knowledge and the prevailing ideas on societies and relations between knowledge and the social context within which it arises.