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In law, sua sponte (Latin: "of his, her, its or their own accord") or suo motu "on its own motion" describes an act of authority taken without formal prompting from another party. The term is usually applied to actions by a judge taken without a prior motion or request from the parties. The form nostra sponte ("of our own accord") is sometimes used by the court itself, when the action is taken by a multi-member court, such as an appellate court, rather than by a single judge (third parties describing such actions would still refer to them as being taken by the court as a whole and therefore as 'sua sponte'). While usually applied to actions of a court, the term may reasonably be applied to actions by government agencies and individuals acting in official capacity.
One situation in which a party might encourage a judge to move sua sponte occurs when that party is preserving a special appearance (usually to challenge jurisdiction), and therefore cannot make motions on its own behalf without making a general appearance. Common reasons for an action taken sua sponte are when the judge determines that the court does not have subject-matter jurisdiction or that the case should be moved to another judge because of a conflict of interest, even if all parties disagree.
- Carlisle v. United States 517 U.S. 416 (1996) – The Supreme Court of the United States ruled that a district court could not move sua sponte to grant a judgment of acquittal (notwithstanding the verdict) to remedy the late filing of the equivalent motion.
- Trest v. Cain 522 U.S. 87 (1997), 94 F.3d 1005 – The United States Court of Appeals for the Fifth Circuit moved sua sponte to reject a habeas corpus claim because of procedural default, citing an obligation to do so. The Supreme Court ruled that this was not obligatory, but declined to rule whether it was permitted.
- The 75th Ranger Regiment (United States Army Rangers) uses Sua Sponte as their regimental motto, referring to the Rangers' ability to accomplish tasks with little to no prompting and to recognize that a Ranger volunteers three times: for the U.S. Army, Airborne School, and service in the 75th Ranger Regiment.
- The Fenn School in Concord, Massachusetts, uses Sua Sponte as its school motto, usually seen written in a furled banner beneath an engraving of the Daniel Chester French The Concord Minute Man of 1775 statue.
- "(See--> Paragraph 26) Political Parties Dispute Tribunal & another v Musalia Mudavadi & 6 others Ex Parte Petronila Were  eKLR". The National Council for Law Reporting (Kenya Law) 17-11- 2014. Retrieved 6 December 2014.
- Carlisle v. United States, 517 U.S. 416 (Supreme Court of the United States 1996).
- Trest v. Cain, 522 U.S. 87 (Supreme Court of the United States 1997).
- US Army Ranger Association http://www.ranger.org/page-593596. Retrieved 29 March 2015. Missing or empty