This chapter surveys headless relative clauses (i.e. ones with no overt head noun) in Yucatec Maya, an indigenous language of southern Mexico. For Indo-European languages, discussion of such constructions has focused on “free relative clauses”—those with only a bare wh-word in place of a head—and to a lesser extent, “light-headed” relative clauses⎯those with a dedicated set of pronominal elements in place of a head noun. In contrast, Yucatec Maya is shown to allow for four different kinds of surface headless relative clause forms depending on the presence or absence of a wh-word and the presence or absence of a determiner, quantifier, or other D-element. With respect to free relative clauses, whereas many more well-studied Indo-European languages have morpho-syntactically distinct constructions for definite and indefinite free relative clauses (e.g. with an infinitive or subjunctive form in the latter case), Yucatec Maya is shown to have a single morpho-syntactic form whose (in)definiteness is determined by syntactic context.