Re Canavan; Re Ludlam; Re Waters; Re Roberts [No 2]; Re Joyce; Re Nash; Re Xenophon (commonly referred to as the "Citizenship Seven case") is a set of cases, heard together by the High Court of Australia sitting as the Court of Disputed Returns, arising from doubts as to the eligibility of a number of members of Parliament to be elected to Parliament because of section 44(i) of the Constitution.