Technical Abstract: Branched-chain saturated fatty acids have potential as oleochemical intermediates since they have better oxidative stability than linear unsaturated fatty acids and have better low-temperature properties than linear saturated fatty acids. Previous studies in converting unsaturated fatty acids to branched-chain fatty acids (bc-FA) using clay catalysts have resulted in only modest yields and conversions. Recent reports, however, have suggested that certain zeolites can be effective catalysts for converting unsaturated fatty acids to branched-chain fatty acids in higher yields and conversions. In this work, we examined the scope and potential of the zeolite-catalyzed synthesis of branched-chain fatty acids starting from readily available monounsaturated linear fatty acids. Our results show that common unsaturated fatty acids such as oleic acid can be converted to branched-chain isomers using modified Ferrierite zeolite catalysts in high conversions (98%) and high selectivity (85%) and that the zeolite catalysts are reusable for at least three cycles. The positions of branching (methyl) on the fatty acid chain were determined from the GC-MS spectra of the picolinyl esters of the bc-FA.