This study is about the structure of relative clause in Afaan Oromoo within the framev; ork ofrnChomsky's (J 993, 1995) Minimalist Program and other recent developments.rnIn Afaan Oromoo relative clauses are classified into two: These are restrictive relative L !ausesrnand non restrictive relative clauses. A res trictive relative clause restricts/delimits the ref-:r encernof the head NP and non restrictive relative clause give only additional information ab (/u t thernpreviously iden t ified head NP. Furthermore, Afaan Oromoo restrictive relative c1a ·-I se isrnpreceded by a pause in speech or a comma in writing, whereas a res trict ive relative clf, use isrnnot. Moreover, Afaan Oromoo rela tive clauses are divided into prenominal and postnr, minalrnrelative clauses depending on whether fh e relative clause precede or follow the head noun.rnAmong the relativization strategies th e language employs relative pronoun strategy and g f,ppingrnstrategy except in prenominal relative clauses and some aspects of genitive relativizat il) n. Inrnlight of Keenan and Comrie's (I977: 6-) accessibility hierarchy, Afaan Oromoo relatividS ifSrnsubject, direct object, indirect object, oblique, genitive and object of comparison.rnIn addition, the study deals with Afaan Oromoo relative verbs which indicate the head nOI Ji1 andrnrelative pronoun. Afaan Oromoo relative verb divided into peljective relative ver i, andrnimperfective relative verb. Perfectir e relative verb describe co mpleted action wherea srnimperfective relative verb expresses incomplete or progressive action.