Abstract: An ozone generator comprises a plurality of inner tubular electrodes each of which has a multiplicity of outwardly extending dimpled projections and each of which is configured for a sliding fit within a dielectric carrier sleeve. An outer tubular electrode is mounted coaxially over each carrier sleeve by means of non-conductive spacers and forms an annular air passageway between each outer electrode and sleeve. The assemblies are mounted longitudinally in an enclosed cylindrical housing by means of an air barrier which surrounds the outer electrodes and divides the housing into upper and lower compartments so that pressurized air which is introduced through an air inlet into the lower compartment passes upwardly through the passageways to the upper compartment where it exits the housing through an ozone outlet. Electrical conductors connect the pairs of inner and outer electrodes in parallel across a source of high voltage remote from the housing.