Which moon is bigger, Titan or Ganymede?

Ganymede has a mean radius of 2631.2 km, while Titan's mean radius is 2574.7 km, so Ganymede is slightly larger Titan: Overview Ganymede: Overview. read more

Since we do not know all the objects in the solar system, Ganymede holds the title for being the largest moon in the solar system. Titan is the second largest, but the largest by far with an atmosphere. read more

Titan is the sixth gravitationally rounded moon from Saturn. Frequently described as a planet-like moon, Titan is 50% larger than Earth's Moon, and it is 80% more massive. It is the second-largest moon in the Solar System, after Jupiter's moon Ganymede, and is larger than the smallest planet, Mercury, but only 40% as massive. read more

Titan, a moon of Saturn, is the largest moon, at 2900 kilometers radius.Ganymede, of Jupiter, is second, at 2640 kilometers radius.The Solar System, Roman Smoluchowski, Scientific American Library, 1983, page 164. read more