Acromegaly is described as a less common chronic disease occursas a result ofover secretion of growth hormone (GH) often from a pituitary adenoma; it is connected to noticeable morbidity and increased mortality. Our study aimed to determine calcium (Ca) and vitamin D status inacromegalic patients regarding disease activity and estimating the relationship between vitamin D, IGF-1 and some biochemical parameters. Correlations of vitamin D with IGF-1, BMI, Ca, GOT, GPT, ALP, T3, T4, TSH, urea and creatinine were studied. The study groups comprise of 50 male, 25 acromegalic patients and 25 control male groups. The results of vitamin D measurements showed a decrease levels of vitamin D in all acromegalic patients and this revealed that patients with acromegaly have a high significant decrease (p < 0.001) of BMI, IGF-1, vitamin D, Ca, GOT and creatinine compared to control group, while significant increase for GPT, ALP, T3, T4 and urea for patients with acromegaly. However, the results showed a highly positive significant association between vitamin D and BMI, IGF-1, urea, creatinine and T4 levels, whereas demonstrated a highly significant positivecorrelation of vitamin D levels with GOT and ALP, also the results showed non-significant difference between vitamin D, Ca and T3 with a negative correlation with TSH also asignificant positive correlation between vitamin D and GPT appeared. We concluded that acromegalic patients were suffering from low vitamin D levels compared to the controls group and also suffering from lower kidney activity (hydroxylation at the position of 25-OH-D3 site) and this is evident from the high creatinine levels in the blood, which leads to the non-activation and even low levels of vitamin D and therefore acromemglic patients will suffer from vitamin D deficiency high risk thus the treatment procedures for acromegaly should include doses of active vitamin D, which reduces the risk of this deficiency.