  We argue that the QCD axion can arise from many aligned axions with decay
constants much smaller than the conventional axion window. If the typical decay
constant is of {\cal O}{(100)} GeV to 1 TeV, one or more of the axions or
saxions may account for the recently found diphoton excess at \sim 750 GeV. Our
scenario predicts many axions and saxions coupled to gluons with decay
constants of order the weak scale, and therefore many collider signatures by
heavy axions and saxions will show up at different energy scales. In
particular, if the inferred broad decay width is due to multiple axions or
saxions, a non-trivial peak structure may become evident when more data is
collected. We also discuss cosmological implications of the aligned QCD axion
scenario. In the Appendix we give a possible UV completion and argue that the
high quality of the Peccei-Quinn symmetry is naturally explained in our
scenario.
