In view of the rapidly aging population, increasing attention has been paid to studying persons with dementia. Factors associated with its onset, prognosis, and treatment as well as ways to support caregivers in the community have been extensively studied. Despite the fact that older persons with dementia are at higher risk of abuse compared to their cognitively unimpaired counterparts in institutions and the community, however, relatively little attention has been paid to understanding such abuse. This review summarizes the available literature on abuse of older persons with dementia. It compares methodologies used across studies and highlights the implications of using different informants, sampling strategies, and abuse subtypes in studying abuse of persons with dementia and discussed the relevant cultural considerations for research. The results of this review provide important information for researchers, policy makers, and practitioners.