The aim of present study is to investigate the complexation tendency and stability values of transition metal ions with nicotinic acid (NA) in aqueous media at room temperature using simple technique of potentiometry. 1N NaNO 3 was used to maintain ionic strength. The stability constants were evaluated by SCOGS computer programme. 1:1 and 1:2 complexes were reported. Metal ligand ratio kept is 1:2. Order of stability was compared and found to follow Irving-William natural order.