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Joseph McCabe published A Biographical Dictionary of Modern Rationalists in 1920 (London: Watts & Co.). Most (though not all) of the individuals therein were later also included in A Biographical Dictionary of Ancient, Medieval and Modern Freethinkers (1945)

A

• ABOUZIT, Firmin
• ABBE, Professor Ernst
• ABBOT, Francis E.
• ABBOTT, George F., B.A.
• ABBOTT, Leonard D.
• ABOUT, Edmond
• ACHELIS, Thomas
• ACKERMANN, Louise V.
• ACOLLAS, Professor E.
• ACOSTA, Uriel
• ADAM, Professor Charles, D. es L.
• ADAMS, Charles Francis
• ADAMS, Francis W. L.
• ADAMS, John, President of the United States
• ADAMS, Robert
• ADAMSON, Professor Robert, Ph.D.
• ADCOCK, A. St. John
• ADICKES, Professor E., Ph.D.
• ADLER, Professor Felix, Ph.D.
• AHRENS, Professor Heinrich, Ph.D.
• AIKENHEAD, Thomas
• AIRY, Sir George B., K.C.B., D.C.L., LL.D., F.R.S.
• AITZEMA, Lieuwe van
• ALBEE, John
• ALCOTT, Amos Bronson
• ALEMBERT, Jean le Rond d’
• ALFIERI, Count V.
• ALGAROTTI, Count F.
• ALLBUTT, Sir Thomas C., K.C.B., M.A., M.D., D.Sc., LL.D., F.R.S.
• ALLEN, Grant, B.A.
• ALLEN, Colonel Ethan
• ALLEN, John. M.D.
• ALLINGHAM, William
• ALLMAN, Professor G. J., LL.D., D.Sc., F.R.S.
• ALLSOP, Thomas
• ALTMEYER, Professor J. J., Ph.D., D.C.L.
• ALVIELLA, Count Goblet d’
• AMARI, Professor M.
• AMICIS, Edmondo de
• AMIEL, Henri F.
• ANDERSON, George

X

• XIMÉNÈS, the Marquis A. L.

Y

• YEARSLEY, Percival Macleod, F.R.C.S.
• YOUMANS, E. L., M.D.
• YOUMANS, W. J., M.D.
• YOUNGHUSBAND, Sir Francis Edward, K.C.S.I., K.C.I.E., C.I.E., LL.D., D.Sec

Z

• ZANARDELLI, Giuseppe
• ZANGWILL, Israel
• ZARCO, Francisco
• ZELLER, Professor Eduard
• ZERFFI, George Gustavus
• ZIEGLER, Professor H. E., Ph.D.
• ZIEGLER, Professor Theobald, Ph.D.
• ZIEHEN, Professor G. T., M.D., Ph.D.
• ZIMMERN, Helen
• ZOLA, Emile
• ZORRILLA, Manuel Ruiz
• ZUEBLIN, Professor Charles, Ph.D., D.B.
• ZUPPETTA, Professor Luigi