This Practice Notice considers concurrent wrongdoers as governed by the Civil Liability Act 1961 (Ireland) (CLA 1961 (IRL)). It describes what a concurrent wrongdoer is and defences that can relied on by parties pursuant to CLA 1961 (IRL). The procedure for claiming a contribution as a concurrent wrongdoer against another concurrent wrongdoer and for joining a third party to proceedings in the High Court, Circuit Court and District Court is examined. Applications to set aside a third-party notice are discussed. It also explains when a party can seek a contribution from a concurrent wrongdoer in separate proceedings and discussed the treatment of concurrent wrongdoers and debt claims.