How to say "self-government" in Japanese

• 自治じちJLPT N2approx.Common
  nounThe common, general word: self-government or autonomy — a region, community or body governing its own affairs. The usual choice when you mean the idea itself, in the abstract.
  その教師きょうしは学生がくせい自治じち委員会いいんかいの決定けっていを支持しじした。↗

  The teacher affirmed the decision of the student council.
• 自治行政じちぎょうせい
  nounLess common: self-government taken from the administrative side — the running of affairs by self-governing bodies. Seldom the word you want for 'self-government' as such; it is really 'self-governing administration'.
• 自治政府じちせいふ
  nounAn actual autonomous or devolved government — the governing body itself, as with devolved government in the UK — rather than self-government as an abstract idea. Choose it when 'self-government' means the institution, not the principle.

For self-government in general or autonomy, the common word 自治 is the usual choice; 自治行政 narrows to the administrative side, and 自治政府 denotes an actual autonomous or devolved government, as in the UK.

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

• 自治じちself-government
• 自治行政じちぎょうせいself-government
• 自治政府じちせいふself-government