The closest galaxies to the Milky Way are part of what is known as the Local Group, a small cluster of galaxies that includes the Milky Way and several others. The two closest galaxies to the Milky Way are:
Andromeda Galaxy (M31): The Andromeda Galaxy is the closest spiral galaxy to the Milky Way and is located approximately 2.537 million light-years away from us. It is slightly larger than the Milky Way and is visible to the naked eye in the night sky from dark locations.
Triangulum Galaxy (M33): The Triangulum Galaxy is the third-largest galaxy in the Local Group and is located about 2.723 million light-years away from the Milky Way. It is also a spiral galaxy, though smaller than both the Milky Way and Andromeda. It can be seen with binoculars under dark sky conditions.
Besides these two, there are several other smaller galaxies in the Local Group, such as the Large Magellanic Cloud, the Small Magellanic Cloud, and various dwarf galaxies.