Recent results about the ozone photochemistry in solid matrices (O 2 , Ar, N 2 ) and water ices are reported. Several areas are reviewed: photochemistry in the visible and UV of ozone monomer, photochemistry of ozone involved in weak complexes, reactivity of atomic oxygen with various partners in nearest neighbour.Although reactions occurring in matrices are not the same as in gas phase, pathways displayed in matrices can bring information for gas phase modelling.