Introduction: Work ability is "the ability of the workers to do work which can fit the demands of mental and physical health, and how good the worker can present currently and in the future". It can also help in understanding the balance between demands and resources of the workers'. This study aimed at assessing work ability index (WAI) as among expatriate in Sharjah and Ajman. Materials and Methods: A cross-sectional study was conducted among 397 workers from different work sites in Sharjah and Ajman, United Arab Emirates (UAE). Among those who gave written consent, data was collected using WAI questionnaire in addition to their personal details. Data was entered into Microsoft Excel and analyzed on SPSS version 20. Results: The sample had more male workers(61.5%); more than 80% were aged less than 40 years; most (65.5%) were service employees or technicians and in the current position for less than 5 years (75.3%). The study sample was mostly(56%) at good WAI level, no subject at poor level, and 16% at moderate level. Significantly higher WAI was seen in the married group and experts by job classification. Conclusion: The proportion of poor-moderate WAI was 16% and no subject at poor level.