Who wrote the love letter that polonius reads to claudius and gertrude?

The love letter that Polonius reads to Claudius and Gertrude in Act II, Scene II of Shakespeare's *Hamlet* is written by Hamlet himself.

However, it's important to note that the letter is a fake. Hamlet deliberately writes it to mislead Polonius, who has become suspicious of his son, Laertes, and his relationship with Ophelia. Hamlet uses the letter to make Polonius think that Laertes is a threat to the king and to Ophelia, hoping that Polonius will take action against him.