Background <p>Pain is common among people living with dementia (PLWD) in the community and is associated with substantial negative consequences for both individuals and caregivers; however, knowledge regarding its prevalence and assessment in a community living population with dementia remains limited. The aim of this systematic review was to examine the prevalence of pain and the pain assessment inventories used among PLWD at home. </p> Method <p>This systematic review was registered in PROSPERO (CRD420251136436) and was conducted in accordance with the PRISMA 2020 statement. The searched databases include PubMed, MEDLINE, CINAHL, APA PsycInfo, AgeLine, the Cochrane Library, and Idunn, covering articles published from January 2000 to February 2026. Quantitative observational studies that reported pain through self-report questionnaires, staff- and/or caregiver- assessments were included to define the prevalence of pain in samples or subsamples of PLWD at home. The database search identified 1,296 records, of which 25 articles from 22 studies were included in the final review.</p> Results <p>Sample sizes ranged from 36 to 1,379 PLWD at home. Pain was reported as any pain occurring within a defined timeframe, pain present on the day of assessment, pain meeting predefined severity criteria, or pain interfering with daily activities. The prevalence of pain among PLWD at home was consistently high, with higher prevalence estimates reported in studies assessing any pain compared with those applying severity or consequence-based criteria. The prevalence of any pain during the past month was found to vary between 36 and 76%. Considerable methodological heterogeneity was observed in terms of pain definitions, assessment methods, and inclusion criteria, which makes comparisons across studies difficult.</p> Conclusion <p>The overall high prevalence of pain identified in this review underscores the need for systematic and standardized pain assessment for PLWD at home.</p>