Whistleblower law refers to the legal protections and procedures available to workers who report suspected wrongdoing in their workplace, such as fraud, health and safety breaches, environmental damage, criminal offences or regulatory non‑compliance. It focuses on safeguarding the worker from dismissal, detriment or other retaliation because of raising concerns.In England & Wales, Scotland and Northern Ireland, the concept is primarily governed by the Public Interest Disclosure Act 1998 (PIDA), now integrated into the Employment Rights Act 1996 and related legislation. It protects “workers” who make a “protected disclosure” in the “public interest” and sets out conditions for internal, regulatory and wider disclosure, as developed extensively in case law.In Ireland, whistleblowing is principally regulated by the Protected Disclosures Acts 2014–2022, which establish a broader, codified regime for “protected disclosures”, mandatory internal reporting channels in many organisations, and detailed procedures and remedies.Across all four jurisdictions, whistleblower law is central to employment law, corporate governance, regulatory compliance and public sector accountability, and is a frequent consideration in HR policies, internal investigations, settlement agreements, and tribunal or court litigation.