The 55-year-old actor "pushed through" the performance but afterwards was taken ill and rushed to hospital.
A spokesperson for Osmond said: "On the evening of Thursday December 27th after pushing through the evening’s performance of Peter Pan atBirmingham Hippodrome, Jimmy Osmond was driven straight to hospital and diagnosed with a stroke.
"He is grateful for all the well wishes and will be taking time out in the new year."
Birmingham Hippodrome have confirmed he will be replaced by TV star Darren Day later this week.
"Everyone here at Birmingham Hippodrome has been deeply saddened to hear of Jimmy’s sudden illness," Fiona Allan from the theatre told ITV news.
"Jimmy loved being a part of the Hippodrome’s well-renowned panto, and his portrayal of Captain Hook was both dastardly and heartwarming.
"He won the adoration not just of our audiences, but also of all our staff – we all send Jimmy and his family very best wishes for a speedy recovery."
Jimmy found fame with his brothers The Osmond Family – and started performing aged just three.
He was the youngest of the group who were the world's biggest band in the 1970s with hits including Crazy Horses and Love Me For A Reason.
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