  We report the first lattice QCD calculation of the glue spin in the nucleon.
The lattice calculation is carried out with valence overlap fermions on 2+1
flavor DWF gauge configurations on four lattice spacings and four volumes
including an ensemble with physical values for the quark masses. The glue spin
$S_{G}$ in the Coulomb gauge in the $\overline{\text{MS}}$ scheme is obtained
with the 1-loop perturbative matching. We find the results fairly insensitive
to lattice spacing and quark masses. We also find that the proton momentum
dependence of $S_G$ in the range $0\leq |\vec{p}| < 1.5$ GeV is very mild, and
we determine it in the large momentum limit to be $S_{G}=0.251(47)(16)$ at the
physical pion mass in the $\overline{\text{MS}}$ scheme at $\mu^2=10$ GeV$^2$.
If the matching procedure in large momentum effective theory is neglected,
$S_G$ is equal to the glue helicity measured in high-energy scattering
experiments.
