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A higher amount of oxygenated compounds in bio-oil obstructs its use in the existing petroleum-based infrastructures. In order to convert oxygenates into hydrocarbons and less reactive compounds, a number of catalysts have been studied in the catalytic fast pyrolysis. The ZSM-5 catalyst has drawn a considerable attention due to its potential to yield high quality bio-oil that is rich in aliphatic and aromatic hydrocarbons and deficient of oxygenating species. This review has focused on shape selectivity of ZSM-5 towards improving the quality of bio-oil from catalytic fast pyrolysis. The uniform pore size, unique channels equipped with elliptical and near-circular openings, mesoporosity, and tunable acidity are considered as the most selective for the production of aromatics and also are responsible for deoxygenation reaction. It has been revealed that pyrolysis intermediates diffuse into ZSM-5 pores and undergo …