There is a strong relationship between economic prosperity and health as well as between muscle strength and health (morbidity and mortality). However, very little research has concomitantly examined economic prosperity and muscular strength in the general population, and no studies have simultaneously examined these factors in a population of adults with intellectual disabilities. This study examined grip strength among adult Special Olympics participants by country economic status. A total of 12,132 (men = 65%) right and left hand grip strength records were available from the Special Olympics International (SOI) FUNFitness database. The 127 countries within the SOI dataset were grouped by economy according to The World Bank’s gross national income per capita as: low-income countries (n = 11), lower middle-income countries (n = 27), upper middle-income countries (n = 38), and high-income countries (n = 51). There was a significant overall effect of country economic status for both males and females for right and left hand grip strength. Although the grip strength of both men and women did not differ between low-income and low-middle income countries, the general trend was to observe greater grip strength with increased economic prosperity among both men and women. However, to advance our knowledge of the importance of muscle strength for persons with intellectual disabilities, research linking grip strength to health outcomes, functional status, and successful participation activities of daily living is needed.