Management of elderly people with type 2 diabetes mellitus (DM) is aimed at attaining optimal levels of serum glucose, avoiding hypoglycemic episodes, preventing the acute complications of uncontrolled hyperglycemia, and preventing or delaying the progression of the chronic complication of diabetes. Moreover, the principles of managing type 2 diabetes mellitus in the elderly are no different from those in younger, but the priorities and therapeutic strategies need to be cautiously individualized. The objectives of treatment are to improve glycaemic control in a stepwise approach that involves non pharmacological methods including diet and exercise, and pharmacological therapy including mixtures of oral anti hyperglycemic agents alone or in combination with insulin. Furthermore, diet and exercise remains the cornerstone of diabetes management. Diet should be designed to provide sufficient calories to achieve or maintain ideal bodyweight. Aim of the study: The aim of this study was to evaluate the effect of nursing intervention program on improving caregivers performance regarding type II diabetes mellitus management in elderly people. Research design: A quasi-experimental design was used. Setting: The study was conducted at six nursing homes in Cairo Study subjects: Fifty-six caregivers from the previously mentioned settings were included in the study. Tools of data collection: Two tools were used; Tool (I): Composed of two parts: Part (A):Caregiver’s socio-demographic characteristics Part (B): Caregiver’s knowledge about management of diabetes mellitus, self-administered questionnaire, to assess caregiver; knowledge about management of diabetes mellitus Tool (II): Caregiver’s practice observation checklist to assess caregiver’s practices regarding insulin injection. Results: Results revealed that:  The main points of knowledge that improved by nursing intervention were as follows; complications of diabetes from 32.1% in pre-sessions, to 98.2% immediately post sessions and 82.1%, at 3 months of post sessions.  Additionally, Care of diabetic foot, from 50.0% in pre-sessions, to 94.6% immediately post sessions and 83.9%, at 3 months of post sessions.  Moreover, the role of exercise and nutrition in type II DM management improved. , from 16.1% in pre-sessions, to 100% immediately post sessions and 98.2%, at 3 months of post sessions.  Furthermore, the total practice score of the studied caregivers were scored as good practice level by 0.0% in preprogram implementation which improved to 83.9% & 62.5% in post and follow up program implementation respectively. Conclusions: The present study concluded that caregivers' performance was greatly improved immediately after implementation of nursing intervention. Unfortunately, this improvement slightly declined in the next three months. Recommendations: The study recommended continuous in service training for caregivers’ about its management regarding diabetes mellitus.