How to say "noon" in Japanese

• 昼ひるJLPT N5approx.Common
  nounThe everyday word for the middle of the day, covering 'noon' and 'midday' without specifying an exact hour. Use it in ordinary conversation when you simply mean the daytime around twelve.
  ケンは昼ひるまで家いえにいるでしょう。↗

  Ken will be at home until noon.
• 正午しょうごJLPT N3approx.Common
  noun, adverbThe precise word for twelve o'clock in the middle of the day. Choose it when the exact time matters, as in schedules, announcements, or deadlines set at noon.
  私わたしたちは、普通ふつう正午しょうごに昼食ちゅうしょくを食たべます。↗

  We usually have lunch at noon.
• 零時れいじCommon
  nounLiterally 'zero o'clock', this normally means midnight, the start of the day on a twenty-four-hour clock. Its 'noon' sense is marginal, so it is seldom the word you want; use 昼 or 正午 instead.
• お昼おひるJLPT N3approx.Common
  nounThis is 昼 with the polite prefix お added; it refers to the same midday period but is the natural choice in polite conversation, where plain 昼 can sound too blunt.
  お昼ひるまでには戻もどってきなさい。↗

  You are supposed to be back by noon.

Use 昼 for midday generally, 正午 when you mean twelve o'clock precisely, 「お昼」 in polite speech, and avoid 零時 for noon, since it normally means midnight.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 昼ひるnoon
• 正午しょうごnoon
• 零時れいじtwelve o'clock
• ヌーンnoon
• 昼時ひるどきnoon
• 午刻ごこくnoon
• 亭午ていごnoon
• 午後零時ごごれいじnoon
• 日午にちごnoon
• １２時じゅうにじtwelve o'clock
• 昼日中ひるひなかdaytime
• お昼おひるnoon