Indefinite Articles (Un/Uno/Una/Un')

The indefinite article in English is simply a or an. Italian has four forms: un, uno, una, and un'. The correct choice follows the same logic as definite articles — it depends on the gender of the noun and the first letter(s) of the word that follows.

---

The Four Forms

Form	Gender	Used Before	Example
un	Masculine	Most consonants and all vowels	un libro, un amico
uno	Masculine	s+consonant, z, gn, pn, ps, x, y	uno studente, uno zaino
una	Feminine	Any consonant	una casa, una zia
un'	Feminine	Any vowel	un'amica, un'isola

---

Masculine: un and uno

un — The Standard Masculine Form

Use un before masculine nouns starting with most consonants and all vowels. Note that un (masculine) before a vowel has no apostrophe.