  Expanding on the recent derivation of tidal actions for scalar particles, we
present here the action for a tidally deformed spin-$1/2$ particle. Focusing on
operators containing two powers of the Weyl tensor, we combine the Hilbert
series with an on-shell amplitude basis to construct the tidal action. With the
tidal action in hand, we compute the leading-post-Minkowskian tidal
contributions to the spin-1/2 -- spin-1/2 amplitude, arising at
$\mathcal{O}(G^{2})$. Our amplitudes provide evidence that the observed long
range spin-universality for the scattering of two point particles extends to
the scattering of tidally deformed objects. From the scattering amplitude we
find the conservative two-body Hamiltonian, linear and angular impulses,
eikonal phase, spin kick, and aligned-spin scattering angle. We present
analogous results in the electromagnetic case along the way.
