Malnutrition is a common and dangerous condition in older adults, which has been associated with an increased risk of mortality. This study aims to evaluate and compare the abilities of Mini Nutritional Assessment short form (MNA-SF), MNA full form (MNA-FF), and geriatric nutritional risk index (GNRI) to predict all-cause and expanded cardiovascular disease (CVD)-related mortality in community-dwelling older adults. This research is an observational cohort study conducted in a community-setting, with a 12-year follow-up involving 1,001 community-living older adults aged ≥65 years who are enrolled in 2009 and followed up until 2021. Nutritional status assessment was carried out in 2009 using MNA-SF, MNA-FF, and GNRI. Multivariate Cox proportional hazards regression was applied to determine adjusted hazard ratios of mortality with 95% confidence intervals. A total of 368 deaths (36.76%) and 122 expanded CVD-related deaths (12.19%) were observed after a median follow-up of 12 years. Compared with normal nutritional status, poor nutritional status assessed by the MNA-SF, MNA-FF, and GNRI was found to be associated with an increased all-cause mortality in older persons. MNA-SF and MNA-FF, but not GNRI, were associated with expanded CVD-related mortality. The MNA-FF showed better discriminatory accuracy for all-cause and expanded CVD-related mortality (C-statistics = 0.77, 95% CI = 0.63-0.79; 0.79, 0.70-0.83) than MNA-SF (0.76, 0.73-0.79; 0.76, 0.72-0.81) and GNRI (0.75, 0.73-0.79; 0.76, 0.72-0.80). Our findings indicate that MNA-SF, MNA-FF, and GNRI were all independent predictors of all-cause mortality. In particular, the MNA-FF may be the best nutritional assessment tool for predicting all-cause and CVD-related mortality among older persons residing in community, compared with MNA-SF and GNRI.