The attempts from the end of the 19th century onwards to scientifically investigate ‘paranormal phenomena’ have intrigued both cultural historians and historians of science. Internationally, the history of parapsychology has received ample scholarly attention in the last decades. Surprisingly, this has not been the case for the Netherlands, where the history of parapsychology is particularly rich. The history of Dutch parapsychology in the 20th century is closely connected to academic psychology. In this dissertation the question is answered: How can we understand the developments of Dutch parapsychology in the context of developments in academic psychology? The relation between parapsychology and psychology is investigated through the developments in the ‘research practice’ of parapsychology. This research practice consists of the research object (e.g. spirits, telepathy, or PSI), the research methods (e.g. qualitative study of spontaneous phenomena or quantitative tests), the institutional developments (e.g. embeddedness in university), and the relationship with the general public. The changes and developments these aspects went through in the 20th century are discussed in seven chronological key periods. It is argued that we can understand Dutch parapsychology as mirroring or reflecting academic psychology. This occurs on four different levels. First, Dutch parapsychology reflects the developments of academic psychology on a practical-institutional level. Dutch parapsychology was linked to psychology throughout its history, whether studied at universities or by individuals. Second, the developments around the parapsychological research object and research methods are parallel to academic psychology. Were late 19th-century parapsychologists looking for proof of life after death and the existence of an autonomous soul, in the second half of the 20th century they were investigating significant deviations from chance. This ‘methodologization’ of the research object is also reflected in academic psychology: ...