We report the synthesis and physical characterization of single-crystalline ${\mathrm{Ce}}_3{\mathrm{MgBi}}_5$, a previously unexplored member of the ${\mathrm{Ce}}_3{MPn}_5$ family. This compound crystallizes in the hexagonal $P{6}_3/mcm$ structure, featuring an anisotropic Ce sublattice composed of zigzag chains along the $c$ axis and a distorted kagome-like network in the basal plane. Magnetization measurements reveal antiferromagnetic order below $T_N\approx 4.2\text{K}$ with strong magnetic anisotropy and multiple field-induced metamagnetic transitions for fields applied perpendicular to [001], leading to a dome-shaped $H–T$ phase diagram. Electrical transport exhibits characteristic signatures of a Ce-based Kondo lattice, including broad resistivity maxima and pronounced field-dependent anomalies in the magnetoresistance and Hall response that track the magnetic phase boundaries. Specific-heat measurements confirm the magnetic transition and show that the full $\text{R}ln2$ entropy expected for a ${\mathrm{Ce}}^{3+}$ Kramers doublet is recovered by 20 K, indicating an extended temperature range of magnetic fluctuations consistent with Kondo correlations. Our results establish ${\mathrm{Ce}}_3{\mathrm{MgBi}}_5$ as a platform within the ${\mathrm{Ce}}_3{MPn}_5$ family for exploring the interplay of geometric frustration, magnetic anisotropy, and Kondo-lattice physics under applied magnetic fields.

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• Kondo effect
• Magnetism
• Antiferromagnets
• Single crystal materials