This paper reports research conducted as a part of a continuing program designed to provide empirical delineation of the communication apprehension construct. Five studies are reported which indicate a substantial correlation (r =−.52 to r =−.72) between oral communication apprehension and self-esteem. Results from two college student samples (N = 192 and N = 272), two samples of elementary and secondary teachers (N = 202, N = 384), and a sample of federal employees (N = 211) indicate highly consistent relationships across age groups and occupational types.