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Orlando Fatibello-Filho is a Brazilian analytical chemist whose research has centered on the development of innovative flow-injection analysis (FIA) methods for the rapid and precise determination of vitamins, food additives, and nutrients in complex matrices. His work has made significant contributions to the field of analytical instrumentation, particularly in the design of tubular ion-selective electrodes and spectrophotometric detection systems tailored for pharmaceutical and agricultural applications. Among his notable contributions, Fatibello-Filho developed a flow-injection spectrophotometric procedure for determining vitamin B1 (thiamine) in multivitamin preparations, as well as potentiometric methods for quantifying saccharin in dietary products and iron(III) in vitamin formulations using graphite-epoxy ion-selective electrodes embedded in PVC matrices. His turbidimetric approach for orthophosphate determination in digested plant material further demonstrates his commitment to accessible, cost-effective analytical solutions for agricultural science. While his early cited works reflect a focused body of research, their practical applications in quality control of food, pharmaceutical, and plant materials underscore their methodological value. Fatibello-Filho's interdisciplinary approach, bridging electrochemistry, spectroscopy, and flow-injection analysis, positions him as an important figure in applied analytical chemistry in Brazil and beyond.