Dual catalysis strategies in photochemical synthesis have been extensively explored, highlighting the synergy between photocatalysts and other catalytic agents. This review discusses various mechanisms of photocatalysis, including photoinduced electron transfer, hydrogen atom transfer, and energy transfer, and their applications in synthetic organic chemistry. The interaction between a photocatalyst and an organic molecule can generate reactive intermediates that are manipulated to form new chemical bonds. Key strategies include redox mediation, Lewis acid catalysis, Brønsted acid/base catalysis, organocatalysis, and transition metal catalysis, each contributing to the efficiency and selectivity of photochemical reactions. Redox mediation involves the use of redox mediators to facilitate electron transfer between the photocatalyst and substrates, enhancing reaction rates and selectivity. Lewis acids can activate heteroatom-containing substrates, influencing electrophilicity and reduction potential. Brønsted acid/base catalysis, particularly through proton-coupled electron transfer, plays a crucial role in controlling reaction pathways. Organocatalysts, such as enamines and hydrogen atom transfer catalysts, enable the formation of complex molecules with high stereo- and regioselectivity. Transition metal complexes and enzymes further expand the range of possible reactions, enabling the synthesis of complex organic molecules. The review also highlights the importance of understanding the mechanisms behind these catalytic processes, as the efficiency and selectivity of photochemical reactions depend on the interplay between different catalysts. The use of redox mediators, Lewis acids, and other catalysts allows for the manipulation of reactive intermediates, enabling the synthesis of a wide range of compounds. The application of these strategies in synthetic chemistry has led to significant advancements in the field, demonstrating the power of dual catalysis in photochemical synthesis.Dual catalysis strategies in photochemical synthesis have been extensively explored, highlighting the synergy between photocatalysts and other catalytic agents. This review discusses various mechanisms of photocatalysis, including photoinduced electron transfer, hydrogen atom transfer, and energy transfer, and their applications in synthetic organic chemistry. The interaction between a photocatalyst and an organic molecule can generate reactive intermediates that are manipulated to form new chemical bonds. Key strategies include redox mediation, Lewis acid catalysis, Brønsted acid/base catalysis, organocatalysis, and transition metal catalysis, each contributing to the efficiency and selectivity of photochemical reactions. Redox mediation involves the use of redox mediators to facilitate electron transfer between the photocatalyst and substrates, enhancing reaction rates and selectivity. Lewis acids can activate heteroatom-containing substrates, influencing electrophilicity and reduction potential. Brønsted acid/base catalysis, particularly through proton-coupled electron transfer, plays a crucial role in controlling reaction pathways. Organocatalysts, such as enamines and hydrogen atom transfer catalysts, enable the formation of complex molecules with high stereo- and regioselectivity. Transition metal complexes and enzymes further expand the range of possible reactions, enabling the synthesis of complex organic molecules. The review also highlights the importance of understanding the mechanisms behind these catalytic processes, as the efficiency and selectivity of photochemical reactions depend on the interplay between different catalysts. The use of redox mediators, Lewis acids, and other catalysts allows for the manipulation of reactive intermediates, enabling the synthesis of a wide range of compounds. The application of these strategies in synthetic chemistry has led to significant advancements in the field, demonstrating the power of dual catalysis in photochemical synthesis.