|Abstract:||We show that Classical Greek hyperbaton involves pervasive phonological movement. Hyperbaton moves prosodic constituents to prosodic positions, subject to prosodic boundaries and to prosodic conditions on well-formedness. Syntactic analyses of hyperbaton fail insofar as they require the movement of heads, phrases, and nonconstituents to positions that are difficult to define syntactically. Furthermore, hyperbaton disobeys anti-locality constraints and a host of well-studied syntactic island conditions. We propose that phonological movement arises as the result of constraint interaction in the phonological component, subsequent to the interface between syntax and phonology.