No, there are no planetary moons in our solar system that are similar in size to Earth. Earth's moon, also known as the Moon, is the largest moon relative to its parent planet in the solar system. However, compared to Earth, the Moon is significantly smaller.
The Moon has a mean diameter of about 3,474 kilometers (2,159 miles), which is approximately one-fourth the size of Earth. The next largest moon in our solar system is Ganymede, which orbits Jupiter. Ganymede has a diameter of approximately 5,268 kilometers (3,273 miles), making it the largest moon in the solar system. However, even Ganymede is considerably smaller than Earth.
Other sizable moons in the solar system include Saturn's moon Titan, which has a diameter of about 5,151 kilometers (3,200 miles), and Jupiter's moon Callisto, with a diameter of approximately 4,821 kilometers (2,995 miles). These moons are among the largest in our solar system, but they are still smaller than Earth.
Earth is unique in its size and composition among the known moons in the solar system. Moons are generally much smaller than planets because they form through processes like accretion and capture of smaller objects, rather than the massive accumulation of matter that forms planets.