Describes the development of a scale to assess individual differences in self-consciousness. Construction of the scale involved testing the 38 initial items with 130 female and 82 male undergraduates. A principal components factor analysis of the data yielded 3 factors accounting for 43% of the variance: Private Self-Consciousness, Public Self-Consciousness, and Social Anxiety. The final version of the scale, which contained 23 items, was administered to several groups of undergraduates (N = 668) to obtain norms, test-retest (2 wks), subscale correlation, and reliability data. Test-retest reliabilities were .84 for the Public Self-Consciousness scale, .79 for the Private Self-Consciousness scale, .73 for the Social Anxiety scale, and .80 for the total score. Public Self-Consciousness correlated moderately with both Private Self-Consciousness and Social Anxiety, while the correlation of Private Self-Consciousness with Social Anxiety fluctuated around zero. No sex differences in scores were observed. Implications for research and therapy are discussed.