  In the era of precision neutrino physics, we study the influence of matter
NSI on the question of neutrino mass ordering and its resolution. At long
baseline experiments, since matter effects play a crucial role in addressing
this very important question, it is timely to investigate how sub-leading
effects due to NSI may affect and drastically alter inferences pertaining to
this question. We demonstrate that the sensitivity to mass ordering gets
significantly impacted due to NSI effects for various long baseline experiments
including the upcoming long baseline experiment, Deep Underground Neutrino
Experiment (DUNE). Finally we draw a comparison of DUNE, with the sensitivities
offered by two of the current neutrino beam experiments NOvA and T2K.
