Possessive determiners (determinantes posesivos) are used to show ownership or other genitive relations between nouns. Spanish has a set of short form possessive determiners and a set of long form possessive determiners.

These forms appear before the noun. They agree with the possessed noun in terms of number and sometimes gender (only in case of first-person plural and second-person plural informal) and only their grammatical person is determined by the possessor. Take a look at the table and keep in mind that the "vosotros" form is only used as the informal plural second-person form in Spain, and Latin American Spanish uses "ustedes" in all contexts.

For example:

These forms appear after the noun which is commonly preceded by an article or demonstrative determiner. They agree in number and gender with the possessed noun in all forms. They are used less commonly than short forms and sometimes not considered true determiners, but are used to add emphasis or contrast about the genitive relations. Check out the table below.

For example:

Both possessive pronouns and possessive determiners show relationships of belonging between elements of the sentence. However, possessive determiners, whether in short or long form, are always accompanied by a noun. Possessive pronouns, on the other hand, are used on their own, because they replace the noun they refer to.