Otho Sackville-Baggins (died aged 102) was the husband of Lobelia Sackville-Baggins and the founder of the short-lived Sackville-Baggins Family. He was representative of the greedy and ill-mannered traits of his family.

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Otho was the only child of Longo Baggins and Camellia Sackville. Through his mother, he was the head of the Sackville Family, so he adopted the double surname out of custom. He married Lobelia Bracegirdle with whom he had a son named Lotho.

He was also second in line to patriarchy of the Baggins Family, and would have been Bilbo Baggins' heir were it not for his adoption of his cousin Frodo. This did not sit well with Otho and his wife, as they both dearly wanted to live in Bag End.

Nevertheless, Otho was a guest at Bilbo's Farewell Party. After Bilbo had vanished in front of the crowd during the celebration, Otho and his wife departed in wrath. He did not live long enough to see Bag End as he died, it was six years later when Lobelia eventually did come into possession of Bag End, and moved in with her son.