QAC

QAC may refer to:


 * Helix QAC, a commercial static code analysis software tool produced by Perforce Software
 * QAC Road, a short city road in Kollam, India
 * Quaternary ammonium cation, positively-charged polyatomic ions of the structure [NR4]+
 * Queen Alexandra College, an independent specialist college of further education based in Harborne, Birmingham
 * Queen Anne's County, Maryland, in the United States
 * Quilmes Atlético Club, an Argentine sports club based in Quilmes, Buenos Aires