Rudolf Maria Holzapfel (26 April 1874, Kraków – 8 February 1930, Muri bei Bern) was a Polish-born Austrian psychologist and philosopher. He was nominated for the Nobel Prize in Literature six times.^[1]

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• Panidealische Psychologie der sozialen Gefühle, 1901
• Panideal. Das Seelenleben und seine soziale Neugestaltung, 2 vols., new ed., 1923
• Welterlebnis, 2 vols., 1928
• Nachgelassene Schriften, 1932