  Genuine multipartite entanglement has been found in some spin chain systems.
However, genuine multipartite nonlocality, which is much rarer than genuine
multipartite entanglement, has never been found in any spin chain system. Here
we present genuine multipartite nonlocality in a spin chain system. After
introducing the definition of genuine multipartite nonlocality and a
multipartite Bell-type inequality, we construct a group of joint measurements
for the inequality in a one-dimensional ferromagnetic $N$-qubit chain with
nearest-neighbor XXZ interaction, and many violations to the inequality have
been found. The violations do indicate that genuine multipartite nonlocality
exists in this ferromagnetic spin-1/2 chain system. Last but not least, we also
calculate genuine multipartite entanglement concurrence in the same spin chain
to demonstrate the difference and relationship between genuine multipartite
nonlocality and genuine multipartite entanglement.
