Bulgarian pronouns change according to gender, number, definiteness and case. Pronouns are classified as: personal, possessive, interrogative, demonstrative, reflexive, universal, negative, indefinite and relative.

In Bulgarian, there are two types of personal pronouns (лични местоимения): long (stressed, free) and short (unstressed, clitic). The long ones are used with both verbs and prepositions (only the direct object forms), whereas the short ones only with verbs. In some special cases the long and the short forms of the object pronouns can be used together. As in English, personal pronouns change depending on their function within the sentence. In Bulgarian, personal pronouns change according to whether it is:

†This set of long forms is obsolete and is nowadays replaced by на + long direct object pronouns: на мен/на мене, на теб/на тебе, на него, на нея, на него, на нас, на вас, на тях.

*Although ѝ is always unstressed, a stress mark is written over it to distinguish it from и "and".

Note that the short indirect object forms can also be used to indicate possession (see table of possessive pronouns below).

There are two kinds of reflexive pronouns (възвратни местоимения): personal and possessive. Both have two forms: long (stressed, free) and short (unstressed, clitic). Reflexive pronouns do not decline for grammatical person. Personal reflexive pronouns have direct object (accusative) and indirect object (dative) forms. Possessive reflexive pronouns agree in gender, number and definiteness only with the owned noun, not with the possessor. They are used when the subject of the verb owns the object. For example: "Аз виждам своя брат" (I see my brother).

There are two types of possessive pronouns: long (stressed, free) and short (unstressed, clitic). The long pronouns agree in gender and number with the modified noun and usually precede it, the short forms are invariable and follow the noun ("мъжът ми").

The long forms can be definite or indefinite (for example "моя раница" means "my rucksack (but I have several)" while "моята раница" means "the only rucksack of mine" or "the rucksack of mine of which we have already spoken (but I could have other ones, too)" ), depending on whether the noun they modify is definite or indefinite, but only the first constituent of the definite noun phrase is used with an article ("моят мъж" or rarely "мъжът мой"). Both long and short forms can be used attributively, meanwhile only long forms can be used predicatively.