It's thought the bird made a home in the tree while it was being stored outside the cathedral before it was put up.
There are rumours another robin is also living in the tree, but these are yet to be confirmed.
Stuart Haynes, from Liverpool Cathedral, told the BBC the robin is a "welcome addition" to the faithful.
Cathedral staff are now working out how to move the robin out safely when the Christmas tree is removed.
Robins and their nests are protected under UK law.
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