Final answer:
Polonius is the father who forbids Ophelia from seeing Hamlet in William Shakespeare's play.
Step-by-step explanation:
The father who enters the room and forbids Ophelia from seeing Hamlet again is Polonius. This passage concerns the characters and plot of William Shakespeare's tragedy 'Hamlet,' which centers around the prince of Denmark as he deals with issues of betrayal, revenge, and insanity. The father, Polonius, believes that Hamlet's affections are not genuine and that his daughter should steer clear of him due to the questionable morality of young men driven by passion.