お父さん
おとうさん
otousan
= father (polite/familiar form)
お父さん (otousan) is the word Japanese speakers use to address or refer to their own father within the family, or to refer to someone else’s father with warmth and respect. Its built-in honorific prefix お- makes it feel both affectionate and polite at the same time.
お父さん is the standard polite-familiar word for “father” used in everyday family life. The key distinction every learner must know is context of reference: when speaking to your father or about him within the family, お父さん is natural. However, when talking about your own father to someone outside your family — a coworker, a teacher, a stranger — Japanese convention requires the humble form 父 (chichi) instead, because using the honorific お父さん to describe your own family member to outsiders sounds immodest. To refer to someone else’s father with respect, お父さん is perfectly correct, and the even more formal お父様 (otousama) is used in very polite or written contexts. Small children often prefer パパ (papa), a loanword widely used in casual home settings.
The single most common mistake learners make with お父さん is using it when speaking about their own father to someone outside the family. In that situation, switch to 父 (chichi): “父は医者です。”(My father is a doctor.) — not お父さん. Conversely, never use 父 when speaking to your father directly, as it would sound cold and distant. A second pitfall: さん in お父さん is a suffix, not the freestanding honorific さん attached to a name, so you cannot drop it or replace it with 様 on its own — use the separate word お父様 for elevated formality.
The kanji 父 (read as ちち chichi on its own) is one of the oldest pictographic characters in the writing system. Its shape originally depicted a hand gripping a stone tool or stick — a visual shorthand for the person who wielded tools and provided guidance in early society. The radical 父 now appears in a small set of related characters and is itself the standalone humble word for one’s own father. In お父さん, the character is read as とう (tou), paired with the honorific prefix お- and the nominal suffix さん to create the familiar form used inside the family.
Everyday use
お父さん、晩ごはんもう準備できたよ。
Otousan, bangohan mou junbi dekita yo.
Dad, dinner is ready now.
Casual / Social Media
父の日にお父さんへ感謝の気持ちを伝えよう。
Chichi no hi ni otousan e kansha no kimochi o tsutaeyou.
Let’s express our gratitude to our fathers on Father’s Day.
Formal / Cultural context
父がいつもお世話になっております。
Chichi ga itsumo osewa ni natte orimasu.
My father is always in your care. (Thank you for looking after my father.)
Father’s Day (父の日, chichi no hi) falls on the third Sunday of June in Japan, following the American calendar. Unlike Mother’s Day, which is dominated by carnations, Father’s Day has a looser set of symbols — yellow roses are sometimes associated with it, but the most common expressions are handmade cards from children and gifts of food or drink chosen to match the father’s tastes. Social media posts addressed to お父さん spike sharply on that day, making the word one of the most searched family terms each June.
The image of the Japanese father has shifted noticeably over the past two decades. The post-war ideal of the 企業戦士 (kigyou senshi, ‘corporate warrior’) — a father defined almost entirely by long office hours and weekend absences — has given way to growing expectations around 育児参加 (ikuji sanka, active childcare involvement). Government campaigns promoting ikumen (育メン), fathers who take an enthusiastic role in raising children, have made お父さん in the home a more visible and celebrated identity, and paternity leave uptake, while still low by international standards, has been rising steadily.