A study was designed to measure the effects of regional dialects on the attitude of the receiver toward the source. Four hundred ninety-two subjects who were randomly selected from a basic communication course listened to a speech given by a native of one of five dialect regions (Southern, Northeastern, General American, New York, and Southwestern) and were then asked to complete a semantic differential designed to measure four dimensions of source credibility. Sex of source, sex of respondent, and dialect of the source were the independent variables analyzed. Significant differences were found on all four credibility dimensions for the main effect of regional dialect; for instance, New York and General American dialects were rated significantly higher on competence dimensions than were other dialects. No significant interactions were found between sex and stimulus conditions. It may be that dialects serve as cues to regional stereotypes, although further research in this area is needed. (Author/SH)