This research aims at identifying, classifying, and analyzing the types of adjective clause found in Journal of English Teaching Forum.Adjective clause is a dependent clause that modifies a noun. It describes, identifies, or gives further information about a noun. The data were randomly collected from five articles of the journal English Teaching Forum Volume. 47 No. 2 and analyzed descriptively using theories of Aarts and Aarts (1982)and Phillips (2000). The results of this research shows that the types of adjective clause found in this journal are restrictive, non-restrictive, and reduce clause. There are 142 data of adjective clauses, consist of 90 data of restrictive clauses, 21 data of non-restrictive clauses, and 31 data of reduce clauses. The study shows that adjective clause are frequently used in journal specially in English Teaching Forum.