Nonreciprocal magnons, characterized by propagation with differing energies along the $k$ and $-k$ directions, are crucial for modern spintronics applications. However, their realization in van der Waals layered antiferromagnets remains elusive. In this Letter, we report robust nonreciprocal magnon behavior in layered honeycomb antiferromagnets $\text{VP}{X}_3$ ($X=\mathrm{S}$, Se, Te). Our results demonstrate that, in addition to their intrinsic Dzyaloshinsky-Moriya interaction, the nonreciprocity of magnons is strongly influenced by the layer number, interlayer coupling, and magnon-magnon interactions. More importantly, in such layered antiferromagnets, the magnon nonreciprocity exhibits an asymmetric periodic dependence on the Néel vector, offering a novel route for experimentally probing antiferromagnetic order parameters in the two-dimensional limit.

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• Magnons
• Non-reciprocal propagation
• Antiferromagnets
• van der Waals systems
• Density functional theory
• Linear spin wave theory