  We report the discovery and tomographic detection of WASP-174b, a planet with
a near-grazing transit on a 4.23-d orbit around a $V$ = 11.9, F6V star with
[Fe/H] = 0.09 $\pm$ 0.09. The planet is in a moderately misaligned orbit with a
sky-projected spin-orbit angle of $\lambda$ = 31$^{\circ}$ $\pm$ 1$^{\circ}$.
This is in agreement with the known tendency for orbits around hotter stars to
be misaligned. Owing to the grazing transit the planet's radius is uncertain,
with a possible range of 0.8-1.8 R$_{\rm Jup}$. The planet's mass has an upper
limit of 1.3 M$_{\rm Jup}$. WASP-174 is the faintest hot-Jupiter system so far
confirmed by tomographic means.
