  A signed graph $\Gamma$ is said to be determined by its spectrum if every
signed graph with the same spectrum as $\Gamma$ is switching isomorphic with
$\Gamma$. Here it is proved that the path $P_n$, interpreted as a signed graph,
is determined by its spectrum if and only if $n\equiv 0, 1$, or 2 (mod 4),
unless $n\in\{8, 13, 14, 17, 29\}$, or $n=3$.
