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The exploration of the vast phase space of transition metal nitrides is critical for discovering novel materials and potential technological applications. Manganese mononitride with a tetragonal structure (space group <i>I</i>4<i>/mmm</i>) was synthesized in a laser-heating diamond anvil cell, which could be quenched to ambient pressure. The bulk modulus of 173 GPa was measured using in situ high-pressure diffraction, and the axial compressibility shows that, under pressure, the <i>a</i> direction is much more compressible than the <i>c</i> direction in tetragonal MnN. DFT results with correction of the on-site repulsion (GGA + <i>U</i>) confirm that tetragonal MnN is energetically stable and antiferromagnetic. This study highlights the need to include on-site repulsion to understand 3<i>d</i> metal nitrides.