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The Motion Sickness Assessment Questionnaire (MSAQ) was developed in order to assess the multiple dimensions of the motion sickness syndrome (gastrointestinal, central nervous system, peripheral, and sopite-related symptoms). The aim of this study was to evaluate the psychometric properties of the Greek version of the MSAQ.The MSAQ was translated into Greek and then translated back into English. Minor differences between the two texts were corrected. The Greek version was then administered to male subjects before and after nauseogenic motion stimulation. With the use of a motor driven rotating chair, the subjects were exposed to Coriolis cross-coupling stimulation. A battery of statistical tests was used to evaluate the psychometric properties of the MSAQ.There were 112 subjects who participated. Internal consistency, measured with Cronbach's alpha coefficient, was excellent for the total scale and subscales. The test-retest evaluation was done with Pearson's coefficient and Bland-Altman's plot for the total score and subscales and showed statistically significant results. Mean total MSAQ score was 19.04 before the exposure and 33.46 after the exposure, which was statistically significant.Results suggest the Greek-MSAQ is a valid instrument with satisfactory internal consistency, reliability, reproducibility, validity, and responsiveness and can be used in future studies of motion sickness in Greek speaking populations. Kousoulis P, Pantes A, Alevetsovitis G, Fydanaki O. Psychometric properties of the Greek version of the Gianaros Motion Sickness Assessment Questionaire. Aerosp Med Hum Perform. 2016; 87(11):954-957.