<p>The generation and control of spin currents are crucial for advancing next-generation spintronic technologies. These technologies depend on materials capable of efficiently sourcing and interconverting spin and charge currents, while overcoming some limitations associated with conventional ferromagnets and heavy metals. Kagome topological antiferromagnetic Weyl semimetals, such as Mn₃Sn, present unique advantages owing to their distinct magnetic order and significant Berry curvature-driven transport phenomena. In this study, we systematically investigate spin current generation and spin-to-charge conversion phenomena in epitaxial (0001)-oriented Mn₃Sn thin films. Our findings reveal a moderate spin Hall angle of 0.9% and a nearly isotropic in-plane spin Hall conductivity of 44.4 (ℏ/e) Ω^-¹.cm^-¹ at room temperature, originating from a combination of intrinsic and extrinsic contributions, as discussed in light of first-principle calculations. Furthermore, in Mn₃Sn(0001)/Ni₈₁Fe₁₉ heterostructures, we observe a high spin-mixing conductance of 28.52 nm^-² and an interfacial spin-transparency of approximately 72%. Notably, we also find that the spin diffusion length in Mn₃Sn(0001) epitaxial films exceeds 15 nm at room temperature. Our results highlight the potential, and limitations, of the topological Weyl noncollinear antiferromagnet Mn₃Sn as an efficient material for spin transport and conversion in prospective spintronic applications.</p>