Contributors to the encyclopedia are listed below in alphabetic order followed by their academic affiliations and the article(s) they contributed. Articles reprinted from the first edition and supplement are indicated respectively by (1967) or (1996) following the article name. Affiliations provided for the authors of these articles were their 1967 or 1996 affiliations. New or updated articles are indicated by (2005) and include the current affiliation for the author.

Nicola Abbagnano
Professor, History of Philosophy, University of Turin
ALIOTTA, ANTONIO (1967)
ARDIGÒ, ROBERTO (1967)
FERRI, LUIGI (1967)
LEONARDO DA VINCI (1967)
POSITIVISM (1967)
PSYCHOLOGISM (1967)
RENSI, GIUSEPPE (1967)
RIGNANO, EUGENIO (1967)

Reuben Abel
Adjunct Associate Professor of Philosophy, Graduate Faculty, New School for Social Research, and Chairman of the Division of Humanities
SCHILLER, FERDINAND CANNING SCOTT (1967)

Francine F. Abeles
Mathematics, Kean University
LOGIC, HISTORY OF: MODERN LOGIC: THE BOOLEAN PERIOD: CARROLL (2005)

Raziel Abelson
Associate Professor and Chairman, Philosophy, University College, New York University
DEFINITION (1967)
ETHICS, HISTORY...