Background: Nearly 2 billion people in the world are suffering from anaemia. Anaemia is the major contributor for the morbidity in India. Through this study we wanted to study the patterns of anaemia among those who are attending the Out Patient Department (OPD) of a tertiary care centre. Based on this our aim is to study socio demographic factors associated with the patients of anaemia attending the Out Patient Department (OPD) of a tertiary care centre and also to describe different haematological indicators and patterns of anaemia in patients attending the Out Patient Department (OPD) of a tertiary care centre Methods: It was a cross sectional observational study conducted in tertiary care centre of Tamil Nadu between March 2021 to August 2021. The basic socio demographic data was collected by interview method. Haematological indicators like Packed Cell Volume (PCV), Red blood cells (RBC) count, Mean Corpuscular Volume (MCV), Mean Haematocrit Concentration, Platelet count, Total Count (TC) were assessed for each patient. Descriptive statistics and chi square test as test of significance were used. Statistical software Epi Info software version 7.2.5 was used for the statistical analysis Results:There were total of 98 participants. Majority of them were females (67.3%) Haemoglobin levels were between 4.4 %to 8.7 % and mean Hb level was 6.9 %. Majority of them (65.3 %) 64 of the participants had moderate anaemia followed by severe anaemia. Conclusion: Moderate anaemia was the most common presentation. Easy fatigability, breathlessness on exertion, and light headedness were most common symptoms. Iron deficiency anaemia is the most common aetiologies. Educational status and age had correlation with severity of anaemia