<p>In this modern era, technology is advancing, and waste and pollution are becoming major problems worldwide, causing serious environmental issues. Among them, plastic waste is increasing dramatically due to the huge demand for plastic products worldwide. Nowadays, the reduction of plastic waste has become a significant challenge due to the slower rate of degradation. Therefore, plastic waste recycling is a more productive alternative than incineration and landfilling. However, there is one way to reuse plastic waste in the form of fibres, to produce fibre-reinforced concrete, which is one of the leading composite materials in the field of the construction industry. In this paper, a comprehensive review was carried out to investigate the influence of recycled polyethylene terephthalate fibres (PET) on the workability, dry density and shrinkage, compressive strength, tensile strength, and flexural properties of concrete. In this regard, more than 890 papers were retrieved from the Scopus and Web of Science databases. Through the PRISMA flowchart analysis, a detailed screening was carried out, after which 89 more recent and previously published articles on recycled PET fibres were reviewed and analysed. The efficiency and properties of plastic PET waste are highlighted, which can be found to influence the fresh and hardened properties of conventional concrete. In both the scientific and construction industries, the use of macro plastic fibres in the field of civil engineering applications is found to have great potential to consume a bulk quantity, which can reduce the disposal and environmental problems.</p>