This paper presents chromosome numbers for twelve species of Aster from Virginia. Camera lucida drawings are given for Aster cordifolius L. (n= 16), A. divaricatus L. (n=9), A. infirmus Michx. (n=9, 2n= 18), A. laevis L. (n=24), A. novae-angliae L. (n=5), A. oblongifolius Nutt. (n=5), A. patens Ait. (n=10), A. paternus Cronquist (n=9, 2n=18), A. pilosus Willd. (n=24), A. prenanthoides Muhil (n= 16), A. puniceus L. (n=8), and A. simplex Willd. (n=16; 32). The chromosome number for A. infirmus Michx. is reported for the first time. Data on the remaining eleven species are compared with chromosome number reports for the taxa in other North American locations.