Translation guide
In Japanese, how you refer to your older brother depends on formality, politeness, and whether you're talking about your own brother or someone else's. The most common and neutral term is 兄 (ani) for your own brother in formal contexts, and お兄さん (oniisan) when addressing him or referring to someone else's brother.
Use when speaking politely about your own older brother to someone outside your family, or in formal situations.
The standard humble term for one's own older brother. Used when talking about him to non-family members.
兄は会社員です。
My older brother is an office worker.
Use when directly calling your older brother within the family, or when talking about him casually to family members.
Affectionate and casual. Commonly used by younger siblings, especially children, but can be used by adults in close families.
お兄ちゃん、遊ぼう！
Big brother, let's play!
Even more casual than お兄ちゃん. Often used by boys or in rough, friendly speech.
兄ちゃん、それ取って。
Bro, pass me that.
Rough, masculine term for older brother. Can also mean 'boss' or 'senior' in gang or close-knit male groups. Use with caution.
Use when talking about the older brother of someone you're not close to, or in polite conversation.
Polite and standard. Can also be used to address a young man whose name you don't know, similar to 'mister'.
田中さんのお兄さんは医者ですか。
Is Tanaka's older brother a doctor?
Very formal and respectful, used historically or in samurai dramas. Not used in modern daily conversation.
Use when talking about your own older brother in casual conversation with friends or peers, without the formality of 兄 or the cuteness of お兄ちゃん.
While 兄 is humble, it's also the default neutral term when speaking casually about your own brother to people you're comfortable with.
兄が昨日帰ってきた。
My older brother came back yesterday.
Use when calling a slightly older male friend or acquaintance 'big brother' in a friendly, sometimes flirtatious way.
Can be used by women or children to address a young man in a friendly manner. Also used in host clubs or by girls referring to an older male friend.
お兄さん、ちょっと手伝ってくれませんか。
Excuse me, sir, could you help me a bit?
Used among male friends or in gangs to refer to a respected senior. Very informal and masculine.
お兄ちゃん is only for your own older brother within the family. Using it for someone else's brother sounds childish or overly familiar. Use お兄さん instead.
兄 (ani) is humble and used for your own brother when speaking to outsiders. お兄さん (oniisan) is honorific and used for someone else's brother or when addressing your own brother politely (though this is less common in modern families).
In Japanese, you often don't need to say 'my' because it's clear from context. Simply saying 兄 (ani) implies 'my older brother'.
Bro, wait up.
Elder brother, I am relieved you are safe.
Bro, let's go for a drink sometime.