Collins Concise English Dictionary © HarperCollins Publishers::
HQ, h.q. abbreviation for
  1. headquarters
WordReference Random House Learner's Dictionary of American English © 2020
H.Q. or h.q. or HQ, an abbreviation of:
  1. headquarters.

WordReference Random House Unabridged Dictionary of American English © 2020
H.Q., 
  • headquarters.
  • Also,  h.q., HQ 
    'HQ' also found in these entries (note: many are not synonyms or translations):
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