The Straight Answer
Cousin in Spanish is primo for males and prima for females. That's it. But if you're only going to learn one word from this page, that's probably enough, and honestly most people stop there and move on. The thing nobody tells you upfront is that this word behaves differently depending on who you're talking about and which country you're in. I've had this conversation at least a dozen times with people trying to write family tree documents or introduce relatives at social events, and every single person hits the same wall about ten minutes in. The wall isn't the basic word. It's the cousin system that Spanish actually uses, which is way more granular than English.
How To Say Cousin In Spanish: The Basic Translation
Primo. Prima. Depending on the gender of the person you're referring to, not the gender of your relationship to them. Your male cousin is primo. Your female cousin is prima. This trips up a lot of people because English doesn't make this distinction at all, so you'll catch native speakers flinching when Americans say things like "mi primo femenina" or something equally confused. The plural forms are primos and primas. Your cousins (male or mixed group) are primos. All-female group of cousins is primas. This follows standard Spanish grammar rules so there's nothing unusual there.
The System Most People Don't Know Exists
English collapses every cousin relationship into one word. Spanish has a whole framework. I learned this the hard way when I was trying to fill out a legal document back in 2018 that asked for "parentesco" and I wrote primo for my first cousin once removed. The notary looked at me like I'd written something offensive. Not because I was wrong about the word cousin, but because I was wrong about the relationship category entirely. Here's how the actual Spanish cousin system works in practice. Primo prima covers your first cousin. That's the child of your aunt or uncle. Straightforward. Prim primo or prima prima segunda is your second cousin. Child of your parent's cousin. If you need to specify the degree, you add segundo or tercera. This is where English speakers usually give up and just say primo for everything because most casual conversations don't require the precision.
Get the Full Details

Primero primo or prima primera once removed is first cousin once removed. That's either your cousin's child or your parent's first cousin. The removed part indicates a generation difference. You can be removed up or down. Primo primo once removed is second cousin once removed. There's also the whole regional variation problem. In some parts of Latin America, particularly in rural areas and older family conversations, you'll hear cousins referred to by names that literally mean "son of my aunt" or "daughter of my uncle." Hij0 de mi tío, hija de mi tía. Sometimes shortened to tio or tía in casual speech, though that gets awkward fast when you're actually talking to your tío about his kid.
What Actually Matters for Real Conversations
95 percent of the time you just need primo and prima. If someone asks you about your family and you say "tengo dos primos y una prima," nobody is going to stop you and ask for a family tree breakdown. That's not how human conversation works in Spanish, just like it doesn't in English. The edge case that gets people is when they're writing something formal or translating documents. I spent about two hours once going back and forth with a translation service because they kept demanding I specify whether my cousin was primo primo or primo primo segundo, and I genuinely didn't know which one I was. Turns out the person asking needed the information for immigration paperwork, and immigration forms in Spanish actually require the specific categorization. There's no workaround for that. You just have to figure it out and fill it in. If you're dealing with legal or official documents, use primo prima for first cousins and add segundo or tercera for second cousins. That covers almost every situation that comes up outside of genealogy work or immigration law.
Pronunciation Is Where People Mess Up
Primo sounds like FREE-moh. The r is rolled but not dramatically. The o at the end is a clear oh sound, not schwa like in English. Prima is PREE-mah. The a is a proper ah sound, like in father, not the uh sound you'd get saying pramma in American English. The mistake I keep seeing is people pronouncing the r too soft, almost like an l or a quick d. If you're saying Plee-mo instead of FREE-mo, it's going to sound wrong to native speakers. Not incomprehensible, but visibly like you learned from a textbook without hearing anyone say it out loud.

The One Thing Nobody Warns You About
In some Spanish-speaking regions, particularly in parts of Mexico and Central America, primos can function as a casual term for close friends who aren't actually related at all. If someone says "son mis primos" and introduces a group of friends, they're using the colloquial sense. It's the same way English speakers say "bro" or "cuz" to non-relatives. Don't be confused. Don't ask for their family trees. They're just friends. I learned this on a trip to Guadalajara and spent twenty minutes trying to figure out why my friend's "primo" looked nothing like him genetically. It took about three seconds for someone to explain it, but I felt pretty foolish going into it thinking I was missing some family secret. So primo for male cousin, prima for female cousin, add segundo or tercera if you need to be specific, and expect the word to stretch beyond literal family in casual conversation. That covers everything you're likely to need.