The number of studies explaining the role of environmental factors in research using infrared thermography in the Arctic is still limited. This article is focused on circadian rhythms, which can influence both the analysis and interpretation of infrared thermography results in the Arctic. Literature published between 1981 and 2019 was selected with the help of PubMed search engine by means of a systematic search by the keyword infrared thermography using the PRISMA system. Having studied the abstracts of relevant open access articles, we selected a total of 81 papers: 40 American, 15 Russian, 11 Canadian, 6 Swedish, 4 Danish, 3 Finnish, and 2 Norwegian. Having assessed the materials and methods against the area of application (medicine and dentistry), we found 12 articles in full compliance with the selection criteria. In conclusion, taking into account different day lengths and light intensities in the Arctic, we point out three circadian rhythm mediators affecting its physiological activity. These are as follows: light of sufficient intensity, suprachiasmatic nuclei and neurotransmitters. Their influence is often reduced in the summer and is linked with changes in skin temperature. Therefore, it is important for researchers to consider time, season, and sleep patterns of the subjects during the selection process in order to obtain accurate temperature measurements using infrared thermography. For citation: Nasution A.I., Pankov M.N., Kir’yanov A.B. Circadian Rhythm Factor in the Analysis and Interpretation of Infrared Thermography Results in the Arctic (Review). Journal of Medical and Biological Research, 2021, vol. 9, no. 4, pp. 444–453. DOI: 10.37482/2687-1491-Z082