Which Look up which in Wiktionary, the free dictionary. Which may refer to: a relative pronoun an English interrogative word which (command), an operating system command Which?, a UK charity and its magazine See also[edit] English relative clauses Interrogative clause Whicher (disambiguation) All pages with titles containing Which Topics referred to by the same term This disambiguation page lists articles associated with the title Which.If an internal link led you here, you may wish to change the link to point directly to the intended article.