While the judges said it may be harsh to disqualify Australian-born candidates who had no reasons to believe they were not exclusively Australian, "those facts must always have been knowable".
In August, Turnbull accused the then opposition New Zealand Labour Party of working with its Australian counterparts to "undermine the position of the deputy prime minister and the government of Australia".
Joyce was born in Australia but had New Zealand citizenship through his father.
Joyce's removal sparks a by-election, to be held on December 2, endangering Prime Minister Malcolm Turnbull's one-seat parliamentary majority and putting it at risk of an opposition-led vote of no confidence, which could spark a general election.
The fate of Deputy Prime Minister Barnaby Joyce is most crucial to the government in an unprecedented political crisis.
Six senators could be disqualified, though the balance of power would not change since senators can be replaced without elections.
Speaking Friday, Turnbull said it was "clearly not the outcome we were hoping for" but denied that his government faces any instability in the absence of Joyce.
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Speaking soon after the announcement of the decision, Joyce admitted he wasn't entirely surprised by the High Court's decision.
In both cases, the lawmaker was born overseas and was disqualified from Parliament.
The Australian Constitution took effect in 1901 and only two lawmakers before now had ever been caught by the ban on dual nationals.
The seven judges rejected the government's argument that five of the lawmakers, including three government lawmakers, should be exempt from the ban because they had not voluntarily acquired or retained citizenship of another country.
"If people are going to have faith in our democracy, then politicians need to start acting with some integrity with some decency and take responsibility for their actions", Di Natale told reporters.
As soon as they found out, they took all reasonable steps required to sever their foreign ties, Walker said.