The Crown of Thorns will be displayed for the public from 10 January, French media reports.
According to the Bible, the Crown of Thorns was used by Jesus’s captors to cause him pain and mock his claim of authority.
The cathedral reopened its doors to the public on 8 December, after extensive restoration works which cost a reported €700m (£582m) and involved an estimated 2,000 masons, carpenters, restorers, roofers, foundry-workers, art experts, sculptors and engineers.
Its reopening ceremony was attended by world leaders. In a speech at the event, French President Emmanuel Macron said of the restoration: “We must treasure this lesson of fragility, humility and will.”