The objective of this research to study self-care of the elderly with diabetes. The sample group consisted of 154 elderly diabetics in Loungnuae Sub-district, Doi Saket District, Chiang Mai Province. The questionnaires used for data collection. The quantitative data were analyzed by using descriptive statistics and Chi-Square test. The results from analyzing the quantitative data showed that the majority of the elderly diabetics were females, aged between 60-69 years old. (70.80%) and were diagnosed as diabetics from one to five years. When knowledge and self-care of the sample group were examined, the results showed that their knowledge about the disease was at a high level and all six aspects of self-care were at a good level ( = 2.45, S.D. = 0.15). When the relationship between individual factors and self-care behavior of the sample group was investigated, it is found that age, knowledge and duration of suffering were not related to their self-care.