  Kagome metals are topological materials with a rich phase diagram featuring
various charge density wave orders and even unconventional superconductivity.
However, little is still known about possible spin-polarized responses in these
non-magnetic compounds. Here, we perform ab-initio calculations of the
intrinsic spin Hall effect (SHE) in the kagome metals AV$_3$Sb$_5$ (A=Cs, Rb,
K), CsTi$_3$Bi$_5$ and ScV$_6$Sn$_6$. We report large spin Hall conductivities,
comparable with the Weyl semimetal TaAs. Additionally, in CsV$_3$Sb$_5$ the SHE
is strongly renormalized by the CDW order. We can understand these results
based on the topological properties of band structures, demonstrating that the
SHE is dominated by the position and shape of the Dirac nodal lines in the
kagome sublattice. Our results suggest kagome materials as a promising, tunable
platform for future spintronics applications.
