<p>Phthalocyanines (Pcs) are macrocyclic compounds known for their wide range of applications. In recent times, these porphyrin-like compounds have received remarkable attention attributable to their structural, optical, and electronic properties. The current study focuses on the synthesis of phthalocyanines, the process of functionalization, and their application in various fields such as solar energy, electronics, catalytic nature, and photodynamic therapy. A wide range of synthetic methodologies spanning classical cyclotetramerization, solvent-free techniques, and the latest techniques known as green chemistry, such as microwave-assisted and catalytic methods, that caused significant shifts in the field through their yields, shortened reaction times, and maintaining minimal negative impact on the environment. The review highlights explore the role of phthalocyanines in photodynamic therapy (PDT), where zinc phthalocyanine (ZnPc) generates singlet oxygen for targeted cancer cell destruction, and their use as electron donors/acceptors in organic photovoltaics (OPVs) and dye-sensitized solar cells (DSSCs), achieving power conversion efficiencies exceeding 8%. Currently, the catalytic role of iron phthalocyanine (FePc) in oxygen reduction reactions (ORR) used in fuel cells, as well as its ability to detect volatile organic compounds (VOCs), was explored. To address the challenges related to solubility and biocompatibility of these compounds, functionalization and recent advancements are discussed. Furthermore, the review discusses the environmentally sustainable methods for synthesis and the applications in spintronics and quantum computing. This establishes phthalocyanines as multifunctional materials and sustainable alternatives to existing conventional technologies in healthcare, energy, and other fields.</p>