  The NEID spectrograph is a R $\sim$ 120,000 resolution fiber-fed and highly
stabilized spectrograph for extreme radial velocity (RV) precision. It is being
commissioned at the 3.5 m WIYN telescope in Kitt Peak National Observatory with
a desired instrumental precision of better than 30 \cms{}. NEID's bandpass of
380 -- 930 nm enables the simultaneous wavelength coverage of activity
indicators from the Ca HK lines in the blue to the Ca IR triplet in the IR. In
this paper we will present our efforts to characterize and mitigate optical
ghosts in the NEID spectrograph during assembly, integration and testing, and
highlight several of the dominant optical element contributors such as the
cross dispersion prism and input optics. We shall present simulations of the
2-D spectrum and discuss the predicted ghost features on the focal plane, and
how they may impact the RV performance for NEID. We also present the mitigation
strategy adopted for each ghost which may be applied to future instrument
designs. This work will enable other instrument builders to potentially avoid
some of these issues, as well as outline mitigation strategies.
