AbstractDue to the narrow width of tubing/reactors used, photochemistry performed in micro‐ and mesoflow systems is significantly more efficient than when performed in batch due to the Beer‐Lambert Law. Owing to the constant removal of product and facility of flow chemical scalability, the degree of degradation observed is generally decreased and the productivity of photochemical processes is increased. In this Personal Account, we describe a wide range of photochemical transformations we have examined using both visible and UV light, covering cyclizations, intermolecular couplings, radical polymerizations, as well as singlet oxygen oxygenations.