It’s an NBA. Since the first letter of the abbreviation "NBA" begins with a vowel sound, we add the article "an".

It’s an NBA, so we say an NBA player, an NBA team, an NBA game, etc. Since the first letter of the abbreviation "NBA" (National Basketball Association) begins with a vowel sound, it takes the article "an".

We met an NBA player last night.

We met a NBA player last night.

When choosing between "a" and "an", it's the pronunciation, not the spelling, which is relevant.

He’s going to get hired by an NBA team soon.

And we say "an N" (not "a N").

The name of her favorite friend begins with an N.

This is a partial list of acronyms that also start with the consonant N and take "an":

• an NAD (Nicotinamide Adenine Dinucleotide)
• an NDA (Non-Disclosure Agreement)
• an NFL (National Football League)
• an NFT (Non-Fungible Token)
• an NGO (Non-Governmental Organization)
• an NLP (Natural Language Processing)
• an NMN (Nicotinamide Mononucleotide)
• an NRA (National Rifle Association)
• an NSA (U.S. National Security Agency)
• an NYSE (New York Stock Exchange)