Possessive pronouns indicate possession, relation, or belonging and refer back to a noun already known in the context. They are linked to the ideas of Pronouns and of Personal Pronouns, because the possessive form depends on the person of the discourse. When they appear with an article, they can function pronominally and replace the possessed noun.

The basic forms vary according to grammatical person and usually agree in gender and number with the possessed noun. Third-person forms can generate ambiguity, so it is common to use dele and dela to clarify possession. In Brazilian Portuguese, vosso and vossa are rare and, to reach a broader audience, people tend to prefer de vocês or seu.

PessoaPerson	FormaForm	ExemploExample
Primeira pessoa singularFirst person singular	meu minhamy (masculine) my (feminine)	o meu livromy book
Segunda pessoa singularSecond person singular	teu tuayour (masculine) your (feminine)	a tua cadeirayour chair
Terceira pessoa singularThird person singular	seu suayour (masculine) your (feminine)	o seu cachorroyour dog
Primeira pessoa pluralFirst person plural	nosso nossaour (masculine) our (feminine)	a nossa casaour house
Segunda pessoa pluralSecond person plural	vosso vossayour (masculine) your (feminine)	o vosso grupoyour group

The possessive agrees in gender and number with the possessed noun, not with the possessor. Therefore, meu changes to minha before a feminine noun, and nossos changes to nossas before a feminine plural noun. This agreement follows the same logic that appears in Possessive Adjectives.

IdeiaIdea	ExemploExample
Gênero masculinoMasculine gender	o meu cadernomy notebook
Gênero femininoFeminine gender	a minha bolsamy bag
Número singularSingular number	o nosso carroour car
Número pluralPlural number	as nossas roupasour clothes

The possessive usually comes before the noun, as in 'my car' and 'our house'. With a definite article, the expression sounds more natural in many contexts, and in Portugal this usage is even more frequent than in Brazil. In short answers or in emphatic position, the possessive can appear after the verb, as in 'É meu', and body and clothing expressions use the article with great frequency.

IdeiaIdea	ExemploExample
Antes do nomeBefore the name	o meu carromy car
Com artigo definidoWith definite article	a minha camisamy shirt
Ênfase após o verboEmphasis after the verb	É meuIt's mine
Corpo e roupaBody and clothing	a tua mãoyour hand

Seu can refer to him, to her, to you, or to tu, and thus can be unclear in third-person sentences. To avoid doubt, it is common to use dele and dela, which make the possession explicit. In Brazilian Portuguese, this solution is especially useful when the reference needs to be unequivocal.

IdeiaIdea	ExemploExample
Seu ambíguoAmbiguity of 'seu'	o seu livroyour book
Dele claroHis is clear	o livro delehis book
Dela claroHers is clear	a bolsa delaher bag
Terceira pessoa precisaThird person needs	a casa delehis house

With a definite article, the possessive can substitute the noun already mentioned and comes to function as a pronoun. Thus, 'meu' means 'my car', 'a minha' means 'my house', and the structure keeps the reference without repeating the name. This usage appears frequently when the context has already made the possessed evident.

IdeiaIdea	ExemploExample
Substituição masculinaMasculine substitution	o meumy
Substituição femininaFeminine substitution	a minhamy
Nome já conhecidoName already known	o nossoour
Referência retomadaReintroduced reference	a tuayour

Possessives organize the relationship between people and things through form, agreement, and position. The safest usage depends on three choices: adjust the form to the gender and number of the noun, decide whether the article will appear, and, when necessary, swap 'seu' for 'dele' or 'dela' to avoid ambiguity. With these rules, possession becomes clear both in simple sentences and in everyday contexts such as family, clothing, and belongings.