The article presents research results on exploring the impact of martial law on research motivation of PhD students of Sumy State Pedagogical University named after A.S. Makarenko majoring in specialty 011 Educational, Pedagogical Sciences. The study was conducted among the first-fourth year PhD students of the 2018-2021 years of admission and involved 22 participants. The results of conducted surveys, observations and interviews proved significant decrease in PhD students’ motivation for research caused by war in Ukraine. These findings were confirmed by the annual report of postgraduate students at the meeting of the Chair of Pedagogy, which demonstrated a significant decrease in their research activity for the second half of the 2021-2022 academic year. The problems affecting research motivation were identified: emotional state deterioration; slow Internet connection; difficulties with research organization (lack of a computer, laptop; impossibility to engage in research work due to lack of necessary living conditions; lack of scientific events in which it would be possible to present the results of one’s research; impossibility of conducting the experiment; destruction of archives; loss of collected material). The ways to improve PhD students’ motivation for research are proposed: strengthening consulting, informational, psychological support for PhD students; involving psychological service in providing PhD students with psychological support; organization of scientific events for approbation of postgraduate students’ research results and providing them with opportunities for creative self-realization; continuing the practice of holding scientific schools for PhD students; changing research topics and research supervisors and so on.