  The OI 777 nm lines are among the most commonly used diagnostics for the
oxygen abundances in the atmospheres of FGK-type stars. However, they form in
conditions that are far from local thermodynamic equilibrium (LTE). We explore
the departures from LTE of atomic oxygen, and their impact on OI lines, across
the Stagger-grid of three-dimensional hydrodynamic model atmospheres. For the
OI 777 nm triplet we find significant departures from LTE. These departures are
larger in stars with larger effective temperatures, smaller surface gravities,
and larger oxygen abundances. We present grids of predicted 3D non-LTE based
equivalent widths for the OI616nm, [OI] 630 nm, [OI] 636 nm, and OI 777 nm
lines, as well as abundance corrections to 1D LTE based results.
