An amoeba is in the protista kingdom, which means that it is a one celled organism
Amoeba is basically a protist that moves with crawling via a pseudopod. This organism was first discovered by August Johann Rosel in the year 1757. It was given the name Proteus Animalcule in the earlier years.
Amoeba belong to the kingdom Amoebozoa which includes the Amoebidae family.