Bilbo Baggins. Another opinion: Although Bilbo Baggins was Frodo's cousin (he is often assumed to be his uncle, but they are in fact cousins), and Bilbo name
…d Frodo as his heir, I don't believe Bilbo was actually Frodo's guardian during the whole of Lord of the Rings. I think his actual guardian was Gandalf the Grey (later Gandalf the White) the wizard that had been friends with him since he was a child. While Bilbo spent his years in Rivendell writing a book, Gandalf was off helping Frodo to save the world, and doing the best he could to protect the young hobbit on his dangerous journey. A 3rd opinion: In the book, Bilbo was 78 years older than Frodo, and he adopted Frodo (age 12) when both of his parents died in a boating accident. Gandalf was an extremely infrequent visitor to the Shire. Gandalf and Frodo were together on the Quest for Mordor for a grand total of three months, and two of those months were spent at Rivendell with Bilbo. I vote for Bilbo as Frodo's guardian. (MORE) 
