Bent arrives at Fulham without the option to sign permanently.
Jol signed Bent when he was in charge of Tottenham and is delighted to bring the England international to Craven Cottage.
Jol said: "Darren Bent is a striker I have always admired. He has shown in the Barclays Premier League that he is composed and clinical in front of goal but, even if he is not scoring, he is involved in some good link-up play, creating opportunities for his team-mates.
"I'm delighted that he has joined us, he gives us pace up front and I am confident that he will add to our goals scored tally this season."
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