Electrical resistivities can be different for charge currents travelling parallel or perpendicular to the magnetization in magnetically ordered conductors or semiconductors, resulting in the well-known planar Hall effect and anisotropic magnetoresistance. Here, we study the analogous anisotropic magnetotransport behavior for magnons in a magnetic insulator Y_3Fe_5O_12. Electrical and thermal magnon injection, and electrical detection methods are used at room temperature with transverse and

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... tudinal geometries to measure the magnon planar Hall effect and anisotropic magnetoresistance, respectively. We observe that the relative difference between magnon current conductivities parallel and perpendicular to the magnetization, with respect to the average magnon conductivity, i.e. |(σ_∥^m-σ_^m)/σ_0^m| , is approximately 5 σ_^m>σ_∥^m.