In linguistics, an object pronoun is a personal pronoun that is used typically as a grammatical object: the direct or indirect object of a verb, or the object of a preposition. Object pronouns contrast with subject pronouns. Object pronouns in English take the objective case, sometimes called the oblique case or object case. For example, the English object pronoun me is found in "They see me" (direct object), "He's giving me my book" (indirect object), and "Sit with me" (object of a preposition); this contrasts with the subject pronoun in "I see them," "I am getting my book," and "I am sitting here."
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Modern English
The English personal and interrogative pronouns have the following subject and object forms:
Middle English
Historically in Middle English the pronoun "you" had separate singular and plural forms with subjective and objective forms of both.
Other languages
In some languages the direct object pronoun and the indirect object pronoun have separate forms. For example, in Spanish, direct object: Lo mandaron a la escuela (They sent him to school) and indirect object: Le mandaron una carta (They sent him a letter). Other languages divide object pronouns into a larger variety of classes. On the other hand, many languages, for example Persian, do not have distinct object pronouns: Man Farsi balad-am (I can speak Persian). Man ra mishenasad. (He knows me).
History
Object pronouns, in languages where they are distinguished from subject pronouns, are typically a vestige of an older case system. English, for example, once had an extensive declension system that specified distinct accusative and dative case forms for both nouns and pronouns. And after a preposition, a noun or pronoun could be in either of these cases, or in the genitive or instrumental case. With the exception of the genitive (the "apostrophe-s" form), in nouns this system disappeared entirely, while in personal pronouns it collapsed into a single case, covering the roles of both accusative and dative, as well as all instances after a preposition. That is, the new oblique (object) case came to be used for the object of either a verb or a preposition, contrasting with the genitive, which links two nouns.
For a discussion of the use of historically object pronouns in subject position in English (e.g. "Jay and me will arrive later"), see the article on English personal pronouns.