Are any moons bigger than our moon?

Yes, both in proportion to its host planet(or minor planet) and in actual size. Ganymede is the largest moon in our Solar System at about 3270 miles in diameter—which means it's even larger than Mercury. Ganymede. read more

In all, two moons are bigger than Mercury(Ganymede and Titan) and four are bigger than our moon: Ganymede, Titan, Callisto, and Io. Charon is the largest moon in relation to its host—the dwarf planet, Pluto—with a diameter of around 750 miles compared to Pluto's diameter of 1475 miles making Charon 51% the size of its host. read more

Jupiter's moon Ganymede is the largest moon in the Solar System, and Ganymede as well as Saturn's moon Titan are both larger than Mercury and Pluto. Earth's Moon, Jupiter's moons Callisto, Io, and Europa, and Neptune's moon Triton are all larger than Pluto, but smaller than Mercury. read more

Our moon, the earths moon, is the fifth largest moon in the solar system. Ganymede is the largest moon (a moon of Jupiter), then Titan is the second largest (moon of Saturn), then third is Callisto (another moon of Jupiter) and the fourth largest is Io (another of Jupiters moons). read more