While lobbying regulation varies widely across countries, a growing number of governments have introduced rules to increase transparency around influence on policymaking over the past two decades, as data from the OECD’s Anti-Corruption and Integrity Outlook 2026 shows. In most cases, these frameworks are enshrined in primary legislation, establishing mandatory registers and disclosure requirements for lobbyists. However, some countries still rely on more limited approaches, such as parliamentary rules of procedure or administrative schemes that apply only to the executive branch, resulting in uneven levels of oversight.

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