How to say "librarian" in Japanese

• 司書ししょCommon
  nounThe usual word for a librarian — someone whose job is at a library. Being the common word, this is what you will normally want when translating 'librarian'.
  司書ししょは主題しゅだいによって本ほんを分類ぶんるいした。↗

  The librarian classified the books according to subject.
• ライブラリアン
  nounThe katakana loanword for 'librarian'. It is less common than 司書 and is not usually the word you want; reach for 司書 unless there is a particular reason to use the English term.
• 図書係としょがかり
  nounCovers the sense 'person in charge of a library', as at a school; it suggests a designated duty rather than a professional librarian's post, for which 司書 is the usual word.
• 図書館員としょかんいん
  nounRefers to a member of a library's staff, with something of a clerical nuance; it is less common than 司書, which is usually the safer choice for 'librarian'.

Use 司書 for a librarian in general; 「ライブラリアン」 is a less common loanword; 図書係 is the person in charge of a library, as at a school; 図書館員 means a library staff member.

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

• 司書ししょlibrarian
• ライブラリアンlibrarian
• 図書係としょがかりlibrarian
• 図書館員としょかんいんlibrary clerk