PhotocatalysisPhotocatalysis is an excellent and ideal process for facilitating various chemical reactions that produce value-added products under mild conditions, thereby overcoming the world's energy and environmental issues associated with burning fossil fuels. In the past decade, substantial progress has been achieved in the photocatalytic degradation of the designated raw material into value-added products under ultraviolet (UV) and visible light. The cost-effective synthesis and layered architecture of Layered Double HydroxidesLayered double hydroxides (LDHs) make them an ideal candidate for the photocatalytic breakdown of selective pollutants. The adaptability of the LDHs’ multifaceted structure significantly contributes to the improvement of their photocatalytic characteristics. The LDHs possess three remarkable features, including intercalation chemistry, structure memory effectMemory effect (SME), and solid-state alkalinity; these features of the LDHs make them promising candidates for photocatalysisPhotocatalysis. In SME, LDHs are treated at high temperatures to convert them into mixed metal oxides, and then, under alkaline conditions, the mixed metal oxides reverse into LDHs. The LDHs obtained from mixed metal oxides exhibit a structural and topological transformation feature, which is promising for their photocatalytic activity. Similarly, the injection of selective molecules in the LDHs’ layered structure enlarges the distance between their layers, providing more space and interaction sites for reactant molecules. The divalent metal cations found in the metal hydroxide layers of LDHs are responsible for their alkalinity. The lone-pair electrons of reactant molecules and other electron-rich species are among the species that LDH alkalinity interacts with to promote catalyzed reactions. Therefore, LDHs are a promising choice as a photocatalyst due to these characteristics. In this chapter, we discussed the synthesis technique of LDHs-based photocatalysts. The primary focus is on the design technique to modify the photocatalytic efficiency of LDHs through control of the elemental ratio, hybridization, and defective engineering. To manufacture the desired solar fuels, high-performance LDH-based photocatalysts for water splitting, CO2 ConversionCO transformation, and NO2 reductionNO2 reduction must be developed. This entails clarifying structure-performance correlations and developing bespoke material development methodologies. The challenges and prospects for LDH-based photocatalysts are summarized to stimulate innovative approaches that further advance the field’s development.