Cockroach is an insect that is very frequent in urban areas. There are many research in the last years who shows the relationship between positive prick test to cockroach and respiratory allergy. We made a retrospective study with patient of the out patient clinic of allergy during July to December 1989, and who had a skin test to cockroach. We found a 27% positivities in the skin test, and most of the patients came from the urban area. The positivity of cockroach and dust mite were present in almost 80% of the patients.