The Championship outfit announced the deal, which will see England Under-21 international Ince move to the City Ground until December 28, on Thursday.
Ince has struggled to break into Hull boss Steve Bruce's first-team plans after signing for the Premier League club in July, with his last appearance in the top flight coming in a 2-1 defeat at Aston Villa on August 31.
The former Blackpool winger will hope to get more opportunities under Stuart Pearce, his former England Under-21 manager.
Forest enjoyed a superb start to the season but have now gone seven games without a win in the Championship.
Ince's debut for the Midlands club could come in their game at Huddersfield Town on Saturday.
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