World Defamation Laws by Country

International defamation law is not one single system. England and Wales, Scotland, Northern Ireland, and Australia each set their own rules on libel, slander, the serious-harm threshold, the defences, and the time limit to sue. This hub compares those regimes and links a full guide for each, plus the separate United States framework.

What counts as defamation across these countries

A defamation claim in every jurisdiction covered here starts from the same common-law idea: a statement that is published to at least one other person, that identifies the claimant, and that lowers the claimant in the estimation of ordinary, reasonable people. The traditional split is between libel (defamation in a permanent form, such as writing, print, or online posts) and slander (transient defamation, usually spoken). England and Wales, Scotland, and Northern Ireland retain a version of that distinction, while Australia abolished the libel and slander labels and treats all defamation as a single cause of action. The decisive modern change has been the arrival of a serious-harm threshold in England and Wales, Scotland, and most of Australia, which filters out trivial reputational complaints before they reach a full trial. Truth, honest opinion, and privilege remain core defences everywhere, though the exact statutory wording differs by jurisdiction.

The United Kingdom is three legal systems, not one

There is no single "UK defamation law." Defamation is a devolved or separately developed area, so each part of the United Kingdom runs its own rules. England and Wales apply the Defamation Act 2013, which introduced the serious-harm test (section 1), modern statutory defences of truth, honest opinion, and publication on a matter of public interest (sections 2 to 4), and a single-publication rule (section 8). Scotland deliberately did not extend the 2013 Act north of the border and instead passed the Defamation and Malicious Publication (Scotland) Act 2021, in force from 8 August 2022, with its own serious-harm test and public-interest defence and its own "pursuer and defender" terminology. Northern Ireland is different again: it never adopted the 2013 Act, and although the Defamation Act (Northern Ireland) 2022 later modernised its statutory defences (truth, honest opinion, publication in the public interest, and peer-reviewed statements), it did not introduce either a serious-harm threshold or a single-publication rule, so older common-law rules still fill those gaps.

Read the dedicated guides for England & Wales, Scotland, and Northern Ireland.

Australia: one model applied state by state

Australia takes the opposite approach to the United Kingdom. Rather than separate systems, the states and territories agreed on uniform Model Defamation Provisions, each enacted locally as a Defamation Act 2005. The 2021 Stage 1 reforms added a serious-harm element (section 10A), a single-publication rule (section 14C), a new public-interest defence (section 29A), and a requirement to serve a concerns notice before suing. Those reforms commenced on 1 July 2021 in New South Wales, Victoria, Queensland, South Australia, the ACT, and Tasmania, but Western Australia and the Northern Territory did not adopt them, so the pre-2021 regime still applies there. Australian courts have also shaped online liability: in Fairfax Media Publications v Voller the High Court treated media companies as publishers of third-party Facebook comments, while in Google v Defteros it held that providing a search-result hyperlink was not itself publication. Damages for non-economic loss are capped and indexed annually. See the full Australia defamation guide.

How the four jurisdictions compare

The table below summarises the headline rules. It is a starting point, not legal advice, and the detail (especially which defence fits a given statement) matters enormously in practice.

How the United States differs

Anyone comparing these systems with the United States will find a very different balance. United States defamation law is shaped by the First Amendment, and the Supreme Court in New York Times Co. v Sullivan held that a public official (later extended to public figures) must prove "actual malice," meaning the publisher knew the statement was false or acted with reckless disregard for the truth. There is no general serious-harm statute, truth is a complete defence, and many states have anti-SLAPP laws that let defendants dismiss meritless claims early. The practical result is that the same statement can be straightforwardly actionable in London and almost unwinnable in New York. For a state-by-state breakdown, see the United States defamation cluster.

Where you can sue and online publication

Because reputation can be damaged wherever a statement is read, cross-border and internet defamation raise difficult questions about where a claim belongs. Courts generally focus on where the claimant has a reputation and where the harm occurred, and several of these regimes restrict forum-shopping. The Scottish 2021 Act, for example, lets a court decline jurisdiction over a defender not domiciled in the United Kingdom unless Scotland is clearly the most appropriate place to sue. The single-publication rules now common across these jurisdictions also stop the limitation clock restarting every time an old online article is viewed. None of this is a substitute for advice on a specific situation, and limitation periods are short, so timing matters.