This study aimed to assess the individual, interpersonal, and environmental factors that relate to physical activity (PA) among older adults in rural communities in Wangthong district, Phitsanulok, Thailand. A cross-sectional study was conducted on 545 elders by multi-stage sampling. The data were collected via a validated questionnaire. Multiple logistic regression analysis was performed to identify potential determinants of PA. Factors including youngest-old (adjusted OR 1.55, 95% CI [1.05–2.28]), high level of income (adjusted OR 1.89, 95% CI [1.17–3.19]), being a member of the elders’ club (adjusted OR 1.68, 95% CI [1.15–2.46]), and high level of perceived self-efficacy (adjusted OR 1.79, 95% CI [1.23–2.61]) indicated higher likelihood of PA ( p < .05). Interventions to improve PA among older people should include improving physical environmental attributes, creating more inexpensive and less time-consuming alternatives for PA, promoting peer support networks and activities to enhance self-efficacy.