A simple, specific and accurate reverse phase liquid chromatographic method was developed for the simultaneous determination of Atorvastatin calcium and Nicotinic acid in tablet dosage forms. The analysis has been performed by using Agilent ZORBAX SB-C18 (150 × 4.6 mm, 3.5 u) and mobile phase containing acetonitrile: distilled water (85:15) at pH 4.5 (adjusted with phosphoric acid). The detection was carried out at 261 nm with a flow rate of 1.0 ml/min. The retention times of Atorvastatin calcium and Nicotinic acid were 6.092 and 3.125 min, respectively. The method was validated according to ICH guidelines. The method was validated for specificity, precision, linearity, accuracy and robustness. The linearity for Atorvastatin calcium and Nicotinic acid were in the range of 2–12 and 10–80 μg/ml respectively. The recoveries of Atorvastatin calcium and Nicotinic acid were found to be in the range of 99.031% and 99.744% respectively. The proposed method was validated and successfully applied to the estimation of Atorvastatin calcium and Nicotinic acid in combined tablet formulation.