A new spectrophotometric method optimized with central composite design (CCD) for quantitative estimation of valsartan (VL) in pharmaceutical preparations was developed. The developed method is based on the oxidation of VL with potassium iodate (KIO3) to form a carboxylic acid derivative. In the presence of the -COOH group, iodide (KI) is oxidized by iodate, leading to the formation of a yellow-colored triiodide ion with an absorption maximum at 352 nm. The CCD, one of the chemometric methods were applied for the determination of the experimental conditions and then Kinetic studies were used for the stability period. The equilibration time was determined as 10 min. The volumes of 0.05 M KI and 0.003 M KIO3 were calculated as 1.92 mL (0.0192 M) and 2.96 mL (0.000177 M), respectively, and the temperature was measured as 27°C. The method was linear in the concentration range of 6-34 µg/mL (R2: 0.996). The LOD and LOQ were obtained as 0.81 and 2.46 µg/mL, respectively. The pharmaceutical dosage forms were analyzed with developed method, and the obtained results ranged from 98.3% to 102.9%. The developed method was a simple, rapid and inexpensive method for routine analysis of VL in pharmaceutical dosage form