We report a systematic investigation of the structural, magnetic, and magnetoelectric properties of single-crystalline ${\mathrm{MnPS}}_3$, a van der Waals honeycomb antiferromagnetic insulator. While isostructural to ${\mathrm{MnPSe}}_3, {\mathrm{MnPS}}_3$ exhibits distinct magnetic behavior characterized by a Néel temperature of $T_{\mathrm{N}}\sim 78$ K and a magnetic point group 2′/$m$ with moments oriented predominantly along the $c$ axis. Thermodynamic analysis via specific heat reveals a significant magnetic entropy release extending well above $T_{\mathrm{N}}$, indicative of robust two-dimensional short-range correlations and a two-/three-dimensional magnetic crossover. Crucially, we observe a magnetic-field-induced electric polarization $\mathrm{\Delta }{P}_z$ when a magnetic field is applied perpendicular to the $z$ direction. The $\mathrm{\Delta }{P}_z$($H$) response exhibits a pronounced and unconventional hysteretic behavior, which we attribute to the interplay between the symmetry-allowed linear ME effect and weak interlayer vdW interactions that govern magnetic domain dynamics. These findings provide fundamental insights into the symmetry-driven magnetoelectric coupling in low-dimensional systems and position ${\mathrm{MnPS}}_3$ as a versatile platform for tunable spintronic and quantum functional devices.

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• Electric polarization
• Magnetic susceptibility
• Magnetoelectric effect