Relative clause formation in English and Modem Standard Arabic (henceforth MSA) appears to be similar in many constructions; however, there are certain aspects which are distinct. In this paper, a contrastive analysis will be undertaken to investigate points of comparison and contrast between relativization in English on the one hand and relativization in MSA on the other. The following major areas will be covered: relative clause formation, relative pronouns, resumptive pronouns, restrictive and nonrestrictive relative clauses, nominal and verbal relative clauses, subject and object relative clauses, free I headless relative clauses, embedding and its types, and finally, the Noun Phrase Accessibility Hierarchy of Keenan and Comrie (1977) in relation to relativization in both English and MSA.