The plasmid profiles of 66 strains of penicillinase-producing Neisseria gonorrhoeae (PPNG), isolated in Peninsular Malaysia, were determined by agarose gel electrophoresis. All the isolates harboured two common plasmid species, a 4.4 x 10 6 Far-East type R plasmid associated with beta-lactamase production and a 2.6 x 106 plasmid of unknown function. In addition to these two plasmids, 51 (77%) PPNG isolates also carried a 24.5 x 106 conjugative plasmid.