Chronic obstructive pulmonary disease (COPD) and ischaemic heart disease (IHD) are two very common entities, which often coexist due to common risk factors notably smoking. Though both are common causes of chronically poor health, only cardiovascular disease has got major health priority and government research funding. COPD is largely underdiagnosed and even unsuspected among cases of IHD. The present study wants to address this relatively unexplored area of magnitude of COPD among cases of IHD. A total of 86 (male-65, female-21) consecutive stable and ambulatory IHD patients diagnosed by cardiologist and fulfilling the criteria for inclusion, were selected from cardiology outpatient department of IPGME&R, Kolkata from January 2005 to August 2006. Associated COPD was found in 51.2% (n = 44) patients of the study group (males-36, females-8) according to GOLD criteria; 90.9% of cases of COPD had moderate to severe disease. This was much higher than the prevalence of COPD among general population. A positive correlation was found between severity of COPD and impaired left ventricular ejection fraction (EF). This study also shows that general perception about COPD is poor among patients and their physicians. Most of the COPD cases (81.8%) of IHD were newly detected in this study by spirometric evaluation. Use of inhaled bronchodilator among the previously diagnosed cases is also very low (15.9%). Awareness regarding coexistence of the two diseases may be helpful in management and reduction of mortality and morbidity of COPD in IHD.