From
Concerning Hobbits:
Quote:
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Bandobras Took, son of Isengrim the Second was four foot five and able to ride a horse. He was surpassed in all Hobbit records only by two famous characters of old
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The answer depends on how loosely you define 'canon'. According to this forum, the world's tallest hobbit is Lindolirian, but if you want to be boring and insist on sticking to the books, Merry and Pippin were the tallest. I don't think Tolkien says which of them had the most inches.