No, Pluto is not the only dwarf planet that orbits the Sun. In fact, there are five dwarf planets officially recognized by the International Astronomical Union (IAU):

* Pluto

* Eris

* Makemake

* Haumea

* Ceres

There are also many other celestial bodies that fit the IAU's definition of a dwarf planet but haven't been officially recognized yet. So, Pluto is just one member of a larger group of dwarf planets in our solar system.