Martin Freeman in The Hobbit: The Desolation of Smaug (2013)
During the Quest of Erebor, Bilbo cockily entered into a conversation of wits with the Dragon Smaug. By doing so, he discovered Smaug's weakness, which helped in defeating the Dragon.
To keep things fair, only one brave feat per Hobbit is listed. Also, the feats are taken from J.R.R. Tolkien's books, not adaptations, in order to include Pippin, as well as Bilbo's original feat of bravery.
During the Quest of Erebor, Bilbo cockily entered into a conversation of wits with the Dragon Smaug. By doing so, he discovered Smaug's weakness, which helped in defeating the Dragon.
During the Quest of the Ring, Frodo carried the One Ring of Sauron for more than 150 days, without succumbing to its corruption until the very end.
During the Quest of the Ring, Sam fought and defeated Shelob, the biggest of the Great Spiders of Middle-earth.
During the Battle of the Pelennor Fields, Merry took the Witch-king's immortality by wounding him with an enchanted dagger, which helped in defeating the Nazgul leader.
During the Battle of the Black Gate, Pippin slew a Troll, which was just about to kill his friend, Beregond.
During the Battle of the Greenfields, Bandobras led a force of Hobbits to defend Shire, and has won the battle by beheading the Orcish leader Golfimbul, with a wooden club.
Golfimbul's head flew through the air, and fell down a rabbit-hole. Allegedly, that's how a game of golf was invented.