Background: Although the assessment of old age disability and its related factors can help us to plan programs to support the elderly people and prevent the disability of this group, such studies were mostly conducted in developing countries. This study was designed to evaluate the severity of disability and its related factors among the elderly population in Kashan, Iran during 2006–7.

 Materials and Methods: A cross-sectional analytical study was conducted on a two-stage clustered sample of 350 elderly cases in Kashan (65 years and older). The data collection tools were demographic and also WHO-DAS-II questionnaires. Chi-square, Fisher Exact test, Spearman correlation coefficient and ANCOVA were used to analyze the data.

Results: Among the studied samples, 75.7% had no or low level disability and only 4.3% had sever one. A Significant relationship was observed between disability and variables such as sex, need to help, place of residency, addiction, regular physical activity, marriage, level of education, lifestyle and previous job. In addition, a positive correlation was observed between disability and sex. Among the variables studied, gender, marriage, need to help, place of residency, regular physical activity and previous job had the most significant correlation with disability.

Conclusions: The severity of studied population disability was lower than that in the other countries. Considering the more prevalence of disability among females, the findings indicate the necessity of paying more attention to the elderly population, especially the female one.