  From an operational criterion of physical reality, a quantifier of
realism-based nonlocality was recently introduced for two-part quantum states.
This measure has shown to capture aspects that are rather different from Bell
nonlocality. Here we take a step further and introduce a tripartite
realism-based nonlocality quantifier. We show that this measure reduces to
genuine tripartite entanglement for a certain class of pure tripartite states
and manifests itself in correlated mixed states even in the absence of quantum
correlations. A case study for noisy GHZ and W states points out the existence
of scenarios where the realism-based nonlocality is monogamous.
