Heavy diesel (200-350^oC) is converted to the lighter fractions to fulfill transportation fuel demand for light vehicles via catalytic or thermal cracking. In the present work, catalytic cracking of diesel is carried out using in house synthesized zeolite catalysts. Three types of zeolite catalysts are synthesized and activity of these catalysts is studied within temperature range from 400 to 450 ^oC. The catalysts are characterized using XRD, FTIR, and N₂-BET techniques. A high pressure autoclave reactor (Parr Instrument Co.) is used to evaluate the activity of the catalysts towards the diesel cracking reaction. The products are analysed using gas chromatography (GC-FID) to evaluate the conversion and selectivity of reaction. The zeolite-y catalyst has shown promising results giving significantly improved conversion of about 90 %.