| Background: The prevalence of degenerative diseases rises with the increasing life expectancy and elderly population. One of the degenerative diseases is dementia. Dementia is a disease that can cause disturbances in cognitive function. Due to its chronic and progressive nature, people with dementia need help from caregivers in carrying out their daily activities and provide cognitive stimulant activities to slow down the deterioration. These two things become difficult during the COVID-19 pandemic because older people must isolate themselves to avoid further damage. Therefore, this research aims to determine the impact of the COVID-19 pandemic on cognitive function in older people with dementia. Methods: This systematic review sought and reviewed observational studies data taken from various databases such as PubMed, EBSCOHost, Google Scholar, and ScienceDirect starting from January to November 2022—using COVID-19, cognitive function, dementia, and elderly along with their synonyms as keywords. Results: As many as 11 literatures with a total of 3132 participants were obtained to be reviewed. Ten out of 11 pieces of literature showed a deterioration in the cognitive function of older people with dementia due to the COVID-19 pandemic. In comparison, one piece of literature showed an improvement in cognitive function that was not significant. Conclusion: The cognitive function of older people with dementia appears to deteriorate when compared between before and during the COVID-19 pandemic. This can be seen as a decrease in MMSE, MoCA, or both scoring results. However, due to confounding variables not being accounted for in the pieces of literature reviewed, it is impossible to pinpoint the Covid-19 pandemic as the exact reason for this deterioration. |