<p>Date palm ash (DPA) is an industrial by-product ash generated from the charcoal industry or the burning of date palm leaves in agricultural areas that poses profound ecological and economic implications. However, researchers have investigated its potential as a renewable and sustainable component to be harnessed as a supplementary cementitious material (SCM). Focusing on DPA's usability, benefits, and drawbacks, this in-depth review aims to investigate the feasibility of using DPA as an SCM in various cementitious composites fabrication. The study reviews DPA's physical, elemental, and mineralogical composition, microstructural characteristics, and pozzolanic activity. After that, it deliberates the DPA's impact on the fresh, hardened, microstructural, and long-term behavior of various cement and geopolymer composites. The outcome shows DPA could be used as a cementitious component due to the pozzolanic qualities to advance the mechanical, microstructural, and durability factors when incorporated with a lower percentage of around 10%. In contrast, above 10%, it is argued these percentages could enhance specific characteristics such as compressive strength and chloride ion permeability. High DPA content is effective in geopolymer composites. The utilization of DPA is rarely investigated in structural elements and is challenged by different questions concerning preparation, standardization, and potential ecological issues.</p>