Acquired Immune Deficiency Syndrome (AIDS) is caused by lymphotropic retrovirus which was first recognised in 1981 and subsequently HIV was discovered in 1983. HIV infection causes derangement in hematopoietic system which directly results in lymphopenia with the progression of disease and leads to decrease in CD4 lymphocytes, which is directly related to prognosis of disease. It is said that other blood cells may also be deranged due to HIV infection leading to anemia, neutropenia or thrombocytopenia. The purpose of this study was to assess various haematological various haematological changes in HIV patients and to correlate the finding with CD4 counts. A total of 50 seropositive patients were studied over a period of 1 year. All patients diagnosed as HIV 1 and 2 were included in the study. Patients with no haematological study or CD4 count were excluded from the study. The hematological parameters included under this study were – Hemoglobin, Total Leucocyte count, Absolute Lymphocyte count, Platelet count, Mean Corpuscular Volume (MCV) and CD4 count. In this study 26 (52%) were male and 24 (48%) were females. Majority of cases (50%) were between the age of 30 – 44 years. Decrease in CD4 count correlated with lymphopenia with CD4 count less than 500/µl in majority (88%). Anemia was the commonest abnormality (62%), predominantly normocytic normochromic type. Thrombocytopenia was the least noted (14%). This study reiterated that absolute lymphocyte count is the best correlated parameter with CD4 count in seropositive patients.