In the current article, we propose an expansion of the trait anxiety concept to include interpersonal or social facets of trait anxiety involving separation from significant others and disclosing aspects of the self to others, as a supplement to the existing focus on social evaluation anxiety. Participants in three studies completed a modified version of the Endler Multidimensional Anxiety Scales that included a measure of trait social evaluation anxiety, as well as new measures of trait separation anxiety and trait self-disclosure anxiety (i.e., three measures of trait social anxiety). Results showed that the social evaluation, separation, and self-disclosure trait anxiety scales have strong psychometric properties and that they represent distinct but related components of trait anxiety. With respect to validity, the facets of trait social anxiety were predictive of related variables including self-concealment, anxiety sensitivity, and trait worry. The theoretical and practical implications of a multifaceted approach to trait social anxiety are discussed in terms of an expanded multidimensional interaction model of anxiety. Copyright © 2002 John Wiley & Sons, Ltd.