  We propose that the possible 750 GeV diphoton excess can be explained in the
color-octet neutrino mass model extended with a scalar singlet $\Phi$. The
model generally contains $N_s$ species of color-octet, electroweak doublet
scalars $S$ and $N_f$ species of color-octet, electroweak triplet $\chi$ or
singlet $\rho$ fermions. While both scalars and fermions contribute to the
production of $\Phi$ through gluon fusion, only the charged members induce the
diphoton decay of $\Phi$. The diphoton rate can be significantly enhanced due
to interference between the scalar and fermion loops. We show that the diphoton
cross section can be from 3 to 10 fb for O(TeV) color-octet particles while
evading all current LHC limits.
