This study examined the associations between residential environment and self-rated mental health (SRMH) among Canadians aged 65 or older (n = 16,304) and whether education and gender moderated the associations. Data came from the 2018 Canadian Housing Survey. Hierarchical multiple regressions were conducted to test the associations. Analyses revealed that increased dwelling size was associated with better SRMH among older women with high school education. Older adults with higher satisfaction with their dwelling design were more likely to report better SRMH, except for women with some college education. Feeling safer in the community was uniquely associated with better SRMH for men with high school education and women with a university degree. Results confirmed significant associations between specific home and residential environment features and SRMH for each gender-by-education group. Environmental programs designed to improve SRMH for older adult populations should consider within- and between-group diversity.