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Background Frailty is a common, multi-factorial, age-related syndrome commonly observed in people with diabetes. Although older diabetics are prone to adverse healthcare outcomes and diabetes increases the risk of developing frailty, little is known about the effects of frailty on diabetes. This paper examines the association between diabetes, frailty, and mortality in Europeans aged ≥50 years. Methods Data were included from The Survey of Health, Ageing and Retirement in Europe (SHARE) waves one and six. A participant's first interview was taken as the baseline and subsequent waves were used for mortality follow-up (time and cause). Frailty and pre-frailty were measured using established cut-offs using the Physical Phenotype (SHARE-FI) and a 55-item Frailty Index (FI-55). Kaplan-Meier survival analysis was used to assess the relationship between frailty and mortality in people with diabetes and significance tested using log-rank test. Cox regression was used to adjust for potential confounders (age, sex, education, income, employment, alcohol use, smoking, hypertension, hypercholesterolaemia, myocardial infarction, stroke, metastatic cancer, chronic lung disease, polypharmacy, self-perceived health and depression). Results Data from 8,954 diabetics aged 50-99 years were included with 1,598 deaths (17.8%). According to the SHARE-FI, 1,971 (22.0%) were frail, 4,183 (46.7%) pre-frail and 2,800 (31.3%) robust. According to the Kaplan-Meier log-rank test survival varied significantly across frailty strata according to both indexes (p<0.001). At 10-year follow-up, adjusting for confounders SHARE-FI frailty and pre-frailty were significantly associated with mortality, adjusted Hazard Ratio (HR) 2.19, (95% CI:1.66-2.89), and 1.38 (95% CI:1.09-1.74), respectively. Results were similar using the FI-55, HR for frailty 1.66 (95% CI:1.09-2.54). Causes of mortality were significantly different according to frailty status (p<0.05). Conclusion Frailty and pre-frailty are independent risk factors for mortality in diabetics. The identification of frailty is important for the risk-stratification and management of middle aged and older patients with diabetes and should be included in the routine assessment of these high-risk individuals. [ABSTRACT FROM AUTHOR]