The provision of consistent, high-quality dementia care training for healthcare professionals in acute care hospital settings has been largely overlooked until recent years. This study was designed to investigate the effect of current healthcare professional dementia care training courses on related knowledge, attitudes, and self-efficacy in hospital nurses and to understand their training-related experiences, willingness, and perceived barriers. Using a cross-sectional design, 201 nurses were recruited from a teaching medical center in Taiwan. A questionnaire was developed by the researchers to evaluate knowledge, attitudes, and self-efficacy related to caring for people with dementia and to elucidate participant experiences and preferences regarding dementia care training courses. Five academic and clinical dementia care experts held three content validity evaluation rounds for the developed questionnaire. Inferential statistics were used to compare the knowledge, attitudes, and self-efficacy related to caring for people with dementia between participants who had and had not attended a dementia care training course. Nearly all (96.5%) of the participants had prior experience caring for people with dementia, but only 25.9% and 7.0% respectively reported haven taken basic and advanced healthcare professional dementia care training courses. Those who had taken either the basic or advanced course earned higher mean knowledge scores than those who had taken neither (p = .009 and p = .027, respectively). Time constraints and scheduling conflicts were identified as the major barriers to attending dementia care training (n = 164, 81.6%). The participants who had attended either the basic or advanced healthcare professional dementia care training course were found to have better dementia care knowledge than those who had not. Stakeholders should work to further reduce the barriers faced by nurses to attending essential dementia care training.